The Demo was just released online and over XboxLive a couple days ago, at first I wasn't too excited, but after playing the demo for about 20 minutes I was totally sold, if I had to give a quick description i'd say it plays like "Mercenaries + Far Cry + a little bit of Pilot Wings (the parachute aspect)"
Antonio Bandearas admires the view
Flashbacks to Missing in action 3
Antonio Banderas Parachutes onto the scene
Antonio Banderas Doesn't take your shit
Antonio Banderas Parachutes onto the scene firing upon innocent civillians
Antonio Banderas curses your silly hat.
Serious guys this game is teh awesome