So Nagash has returned and apparently the Old World is getting fucked. I got this list from Heresy Online, summing up the current situation (after reading the Nagash book, I think):
SPOILERS!!!!!
Undead
-Nagash has been resurrected by Arkhan the Black and Mannfred von Carstein by sacrifcing several important figures including Aliathra the Everchild and Volkmar the Grim. He then resurrects Vlad von Carstein.
-In order to achieve this resurrection Mannfred and Arkhan gathered the artefacts of Nagash, along the way Arkhan had to kill Heinrich Kemmler who turned to Chaos and Anark von Carstein who tried to murder him, and Mannfred killed Warlord Feskit of Mordkin and Markos von Carstein. Meanwhile Elize von Carstein has killed Cicatrix the Beautiful.
-Once Nagash is resurrected he binds the Undead to his will, including Neferata. He then assaults Karak Azul and is responsible for the deaths of Thorek Ironbrow and King Kazador. He then finds either the tomb of Valaya or the actual Ancestor Goddess herself and drains her magic from her, meaning the Dwarfs are down an Ancestor God.
-Zacharias the Everliving is killed for trying to bargain with Nagash as is Melkhior. Dieter Helsnicht however is smart and bends the knee.
-Nagash and co then march on Nehekhara and wage war with the Tomb Kings. Using Arkhan as a trojan horse Nagash sneaks into the city inside the captured Arkhan, while Krell is possibly killed for good, and manages to get out of Arkhan's body and start causing chaos. Settra meanwhile tries to find the Destroyer of Eternities but can't because the Skaven have told Apophas about it and he stole it. Nagash and Dieter Helsnicht start a ritual that allows Nagash to go into the spirit world and confront Usirian, The Nehekharan God of Death, and kills him and then takes his power, leaving Helsnicht as the Guardian of the Underworld.
-Nagash defeats the Tomb Kings and kills Apophas when the assassin tries to kill him and fails. Khalida bends the knee and Nagash takes his army north to wage war with Chaos, but Settra has survived and someone else is invested in helping him.
The Elves
-Teclis is working with Malekith and is responsible for the Everchild being captured in the first place, in a xanatos gambit to weaken Nagash so that he won't just rush in and get killed fighting Chaos.
-Daemons are swarming all over Ulthuan and Tyrion is leading the defence, he does not know what Teclis has done but it's likely he's going to find out.
-Alarielle is in Athel Loren trying to help Ariel the Mage Queen heal from the dying forest and Oak of Ages.
-Finubar has gone into exile in the Heavenbright tower, trying to figure out what to do about the End Times.
-Eltharion the Grim and Belannaer have been killed by Arkhan the Black and Mannfred von Carstein respectively, and Eldyra of Tiranoc has been turned into an Elf-Vampire by Mannfred.
-Also a Wood Elf raiding party has been teleported to Ulthuan by Lileath herself for reasons unknown.
The Dwarfs
-King Ungrim Ironfist has bested the biggest army of Beastmen in the world led by Malagor the Dark Omen, but 8 out of every 10 Dwarfs in Karak Kadrin are now dead and they must lick their wounds.
-King Kazador and Thorek Ironbrow are dead, and Karak Azul is gone with them. Nagash used this battle to locate either the body of Valaya or the goddess herself and drain her magic. So the Dwarfs are down an Ancestor God.
-Gotrek Gurnisson is in Kislev fighting against the hordes.
-The Underway is apparently filled with Skaven and Goblins, but the Holds have not yet come under attack by them.
Bretonnia
-Mallobaude the Serpent teamed up with Arkhan the Black to unseat King Louen Leoncouer, his father, and killed him in battle. However the Green Knight arrived and killed Mallobaude, then revealed himself to be Gilles le Breton who is now the restored King of Bretonnia.
-La Maisontaal Abbey is gone, plundered by Arkhan the Black. Duke Tancred of Quenelles and Theoderic of Brionne are dead by his forces.
-Morgiana le Fay was turned over to Mannfred by Drycha for reasons unknown, turned into a vampire and ritually sacrificed by Arkhan who has promised to let her rest in peace.
-Bretonnia is still in chaos with half the realm denounced as traitors for supporting Mallobaude and the undead hordes pillaging the ruined provinces.
Wood Elves
-Heinrich Kemmler shattered the Vaults of Winter and let all the bad stuff out. Because of that the Oak of Ages is dying and Ariel the Mage Queen with it. Orion is pissed to hell and taking it out on anything that even comes close to Athel Loren.
-Durthu and the Treekin are walking the razors edge of insanity.
-Beastmen and plague are ravaging the forest, only Orion and the Wild Hunt are holding them back.
-Araloth of Talsyn and his troops have been taken to Ulthuan by Lileath for reasons unknown.
The Skaven
-The Skaven have finally united as a race and have emerged. Tilea and Estalia are gone, devoured and enslaved by the forces of the Under-Empire, and Araby is being besieged above and below by their forces.
-Clan Mordkin has lost it's leadership to Mannfred who killed them and took the Fellblade.
-The Skaven attempted to ensure Nagash's death by informing Apophas of the Destroyer of Eternities but it didn't work out.
Chaos
-Archaon and his forces are kicking ass and taking names all over the planet.
-Vardek Crom is dead, killed by Valten in an ill-fated attack on the Empire.
-Heinrich Kemmler turned to Chaos and has died for it, as did Walach Harkon.
-Valkia the Bloody is besieging Naggarond at the head of a massive army.
-Throgg the Winter King controls the north of Kislev and is attempting to find out how to make other Trolls smart like him.
-The Changeling attempted to assassinate Karl Franz and Valten and was bested by the latter.
The Empire
-Volkmar is dead, sacrificed to resurrect Nagash.
-Countess Emmanuelle von Liebwitz is dead along with most of the nobles of Nuln after the peasants rebelled.
-Leitdorf, the Grand Master of the Knights of Sigmar's Blood, is dead along with a good chunk of his order after they attempted to stop Mannfred and Arkhan's ritual.
-Balthasar Gelt has turned to the dark side, attempting to fix something allowed Vlad von Carstein to manipulate him into becoming a necromancer, and an unfortunate incident with the Elector Count of Hochland resulted in him dying so that Gelt's secret can be kept. Gelt then tried to protect the Emperor from an assassin and revealed his new necromantic powers, and has had to flee the Empire because of it. The Witch Hunters went medieval on the Gold Order for it.
-The Changeling attempted to assassinate Karl Franz. Ludwig Schwarzhelm is dead along with half of the Reiksguard, but Valten banished the Daemon. Karl Franz gave him Ghal-Maraz and in battle with Chaos Valten kills Vardek Crom and Karl Franz is badly wounded by Walach Harkon who is then killed by Vlad von Carstein.
-Kurt Helborg is dreaming of his death against a Greater Daemon of Nurgle but has survived an encounter with one during the battle.
-Vlad von Carstein has infiltrated the Empire and is doing god knows what with part of their defences.
-The Amber Order is now leading the other Colleges of Magic since their magic, the Wind of Death, is pretty much ascendant now.
The Beastmen
-The Beastmen under Malagor the Dark Omen have summoned the Great Herdstones across the planet and are just waging war all across the surface of the world for the evulz. But Malagor's own army has been destroyed by Karak Kadrin, Malagor's own fate is unknown.
The Lizardmen
-The Daemons are going medieval on Lustria, and the entire continent is aflame.
The Orcs and Goblins
-Every single Orc in the Badlands has mobilized and they are currently fighting to find out who will be dominant. No word on what the Goblins are doing.
The Ogres
-The Ogres are on the move. No word on where.
Other
-Kislev is gone. The north is ruled by Throgg the Winter King and Archaon's forces, while the south has been annexed into Ostermark. The Tsarina was last seen leading attacks on Chaos forces with her Ungol horsemen troops, but Kislev as a state is dead.