Can't really think of a action game they would bring. It's gonna be a big surprise whatever it is I think. They said it was highly requested. So it has to be something of a big deal.
Bloodborne confirmed!
Seriously though,
I'm guessing they get lots of requests for all kinds of stuff and I realize they have to hype it up a bit regardless. P
I'm hopeful though and I'd be happy with any of the stuff I mentioned above. ( El Shaddai, Drakengard 3, Metal Wolf Chaos, Otogi , Shadows of the Damned, Lollipop Chainsaw, Nier, Dragon's Crown, Vanquish etc)
Honestly that type of game tended to be mostly the console exclusive stuff I actually wanted on PC, more than a lot of the bigger AAA shooters, driving, sports etc exclusives that generally got hyped as the big exclusives.