Same makers of Rome Total War has snatched up rights to the game version of Warhammer Fantasy.
http://www.pcgamer.com/2013/02/15/what-we-want-to-see-from-the-creative-assembly-warhammer-game/?ns_campaign=article-feed&ns_mchannel=ref&ns_source=steam&ns_linkname=0&ns_fee=0
Sooo.... we are going to get a reskin of a total war game. Meh.
Maybe... Maybe not. I doubt a completely unrestricted Warhammer total war would be done as it removes a need to buy the figures, fun as it would be. GW have been jumpy enough about Vassal, as I recall, and that's hardly a mainstream "front page on Steam" program. If forced to predict, I'd go for a limited-roster scripted battle game like Horned Rat or Mark of Chaos, the mentioned mordheim option (out of print, a wave to the fans, small and manageable (like space hulk & BB) with plenty of DLC options for new warbands, CA's current weapon of choice) or - from CA's past - a Total Warrior style hack-em-up.