I don't know much about The End Times in the Warhammer universe. But we played part of this campaign (the Fall of Altdorf) doing battles with Warmaster and The Uncharted Seas and skirmishes with Song of Blades and Heroes. All in all, a very fun experience...
So let's have a look at it:
The details of the Fall of Altdorf (in french):
THE UNCHARTED SEAS
SONG OF BLADES AND HEROES