First In Game Footage of Deadpool in Marvel vs Capcom 3
IGN has posted the first in game footage of Deadpool in Marvel vs Capcom 3 , as well as several high...

http://www.deadpoolbugle.com/2010/06/first-in-game-footage-of-deadpool-in.html

UPDATE: The official Marvel vs Capcom 3 YouTube channel has posted additional game play videos featuring Deadpool. Thanks to khal for the tip.
Gameplay Video 1
Gameplay Video 2
Gameplay Video 3