The 3DS booth is pretty packed at GDC this year, but a Capcom representative was nice enough to get me some hands on time with the amazingly gorgeous Resident Evil: The Mercenaries 3D. It was the first time I'd gotten playable time with the game, and I'm very impressed with how well it plays. Even as a long-time fan of Resident Evil games, Mercenaries is easily among the smoothest and best playing games in the series. And yes, you really can move and shoot.
Resident Evil: The Mercenaries 3D is, as described by the Capcom representative, a celebration of the 15 years of Resident Evil history. If you played the Mercenaries mode in Resident Evil 4 or 5 then you should be familiar with the basic mechanics. Kill a lot of zombies in the time limit, and build up as high a score as possible.