S.T.A.L.K.E.R. - Clear Sky Revealed @ CVG

THQ and GSC have revealed the S.T.A.L.K.E.R. follow-up, titled Clear Sky.  It looks like they've done an exclusive deal in the UK with PC Zone, so the overview comes via CVG:

PC Zone explains that Clear Sky's game world consists for 50 percent new territory and 50 percent twisted renditions of what you've played before.

Sitting comfortably with the main storyline is an AI-driven stalker war. Players will be able to ally themselves with any of eight factions and work with them to seize control of important locations and ultimately assault enemy faction bases.

Even though you may think you're a stalker god, the factions think otherwise until you prove your worth. So, you start out as a rookie and have to climb up the ranks. At the top of the ladder you'll be handed missions more intrinsic to winning the war.

It's explained that players are not forced into joining factions, but apparently the destruction of one of the primary groups is necessary to open up the main 'path' to the heart of Clear Sky's main event.