I'm not sure why you'd want Cryengine 3. When's the last time you saw a good console port? I'm willing to bet (but do not know for sure) that it will end up having some problem that will make it undesirable to use. Whether that's going to be lack of SDK, terrible performance/optimization, or locked down code we won't know until it's released.
I think it's a non-issue for now, since the devs haven't even got it running on Wars yet, let alone making us all go run out and buy a new game.