Not happening, at least not until "Hobbit" movies are being made. Some time after the last movie is out and the hype is gone they would have to replace the Third "Big" game for something else.
I'm not sure they need to bother waiting. I'm a big fan of the
LOTR SBG and as far as I can see, GW is doing a pretty good job of killing
The Hobbit right from the get-go. Overpriced releases, "starter" sets with limited playability, total lack of promotion or support. Based on the response to the releases for the first movie, I would hazard a guess that the only thing that will keep them releasing for the next two movies will be their contractural obligations to do so.
That said, the death of specialist games has re-ignited my interest in BFG and sparked me to finally put togther the Ork fleet I'd been planning on doing for years now. Of course its all coming off eBay, and I'm paying more for it than I would if I'd bought it last year from GW, but I've already got a sizable fleet inbound.
Now, if I could just find some of those Fighta-Bomberz miniatures...