Fallout 4? Under adventure/shooter?
I'm really just grabbing at straws and hope FO4 comes out soon....
I, for one, am extremely grateful that Bethesda hasn't (and won't) fall into the routine of yearly rehashes. The one thing I can always count on Bethesda for is making the effort to take their games to a new level with every release. Where some developers are content to simply throw on a new coat of paint and rearrange the furniture, Bethesda rebuilds the house. It's only been two and a half years since Fallout 3, and we just had Fallout: New Vegas. Give it time, it'll be worth the wait.
In regards to the topic: It's probably Prey 2, or maybe they'll surprise us with a new accouncement. Though that would seem a bit much, considering Prey 2 hasn't gotten much exposure yet. It's definitely not Skyrim, though. And the probability of it being Fallout 4 is infinitesimal.