Right now, surfing VGchartz.
That should change as more games come out for PS4. So far, there's a rumor that The Evil Within will be coming out in February (which I so hope is true!) which is based on an FYE box (check The Evil Within FB page at fan posts) and the Wal-mart Website saying that it'll be shipped Feb. 1, 2014.
If not, I'm sure Thief should be a lot of fun!
As for what to do until then, Madden 25, KZ:SF online, and cheap games on Steam!