I think full frame is coming. I would guess that it will have IBIS, as it would be a big selling point against most of the other full frame options out there. It still make senses for telephotos to have stabilization in the lens available, although honestly, if they released two versions -- one with and one without, I would choose the one without.
As to when full frame is coming, I have no idea. My experience with Ricoh to this point is that they release gear when they think it is ready, whether or not that coincides with a big photography meeting. In fact, they seem more likely to release things at other times so as not to have their announcement's thunder stolen by whatever Nikon or Canon or Sony are releasing.
Last edited by Rondec; 02-03-2015 at 10:12 AM.