Tomb Kongs should be out this year, ogres early next... I havent heard anything about any other WFB army releases, but then GW do play things very close to their chests.
I really, really doubt HE will get a new book anytime soon- its simply isnt needed, and while there are armies out there that are several rulesets out of date and suffering badly there shouldnt be any of the 'newer' armies getting re-done.
You might have heard about the october release (possibly september- I forget the date) of Island of Blood... which is a HE release event of a sort- Its the new core game with skaven vs HE with loads of cool new models for each. The best one is the HE prince on griffin (though why anyone would take a griffin over a sun dragon for other then aesthetic reasons is beyond me).