Well,CE3 engine is "just" an improved version of CE2.
And generally "it" was pimped to devs for quite some time,there were even rumblings about it being demoed on consoles last year...the result is one MMORPG in the making,outside of Crytek
In the end this is all about middleware business and i just don't see people ditching their custom engines or UE3 after all the troubles,pain,money spent on it.
I have a feeling that we are not going too see much of CE3 this gen,unless there are some secret games that have been in the making for at least a year.
I could be wrong,maybe there will be tons of games for it at E3...