"Beginning in 2009, the AGP Tour™ will be hosting four international tournaments, called the AGP Majors. Held every three months, each Major will feature one FPS 1v1 game. Following each Major, a new game season will begin based on another 1v1 FPS title. The games chosen for the 2009 seasons are as follows (in no particular order):
Quake 4
Quake 3 or potentially Quake Live
Warsow
Unreal Tournament 3"

There is a press release on their site which contains more details : http://www.agptour.com/press1.html