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ValveTime.co.uk | Valve News, Forums, Steam
That one guy at vavle said "we will be releasing them strategically over summer"
I bet once HL2 goes gold their start releasing them one at a time like they did with the last ones... just to keep us tide'ed over while its in the weeks of production.
Probably be part of a huge marketing push once its going gold to get everybody (meaning more casual gamers) thinking about it again since its been almost a year delayed and getting them pumped up to buy the game.