Marty Sliva (from IGN) went to Japan for a 3 day stay to see some games. One game from Sony Japan Studio and one from a studio he couldn't mention. The embargo ends 'early February'. He said that The Last Guardian isn't one of the games he saw (obviously), and he also said that one of the games is a game he's really excited about and what he saw was confirming his expections about the game.

Source: http://www.ign.com/articles/2015/01/21/podcast-beyond-episode-378-our-favorite-psp-memories (1:32-4:13 in the video)

Maybe Platinum Games?

I need to become a game journalist...

Gravity Rush 2 finally shows up again!?

Maybe Gravity Rush 2 for PS4? From December 22nd 2014:

Keiichi Toyama (SCEJ)
- It's been a long time since new information about the new Gravity Daze has surfaced, but people will understand immediately why when they see new footage

http://www.neogaf.com/forum/showthread.php?t=957112

That sure sounds like it isn't a PS Vita only title, so maybe Sony will confirm and show Gravity Rush 2 for PS4 in February?

It will be great if gravity rush 2 comes to PS4.

A new JRPG?!

Bloodborne

He says it's confirming expectations so it's a game he/we already knew about.