No one knows as of yet. It is most likely a new KOTOR. Someone mentioned that the guy could be Vader unmasked, though the poster confirmed it isn't him.
It's not KOTOR, bioware said that for now they are working on a KOTOR mmorpg (The Old Republic) so it's definitely not KOTOR 3. The screens suggest a Force Unleashed sequel to me.
I'm pretty sure they said so in an interview, and bioware isn't the kinda company who would work on 2 games from the same franchise, not when they're also busy with Dragon Age, and Mass Effect 2. It also doesn't look like kotor imo.
Although I must say they have announced an "Untitled Next Gen Game" but it's too early in development to have those kinds of screenshots. Even if they aren't gameplay ones...
It can't be concept art because it isn't drawn it's digital and the blur looks as if it was taken mid movement.