I don't think Source 2 was a surprise to many. Most of the people in the Dota 2 and CS:GO communities have been expecting it for a long time. Valve even explici

I don't think Source 2 was a surprise to many. Most of the people in the Dota 2 and CS:GO communities have been expecting it for a long time. Valve even explicitly stated[1] in early December that they planned "a major improvement to Dota 2’s engine that [they] are aiming to release in the first half of next year" [1] - http://blog.dota2.com/2014/12/future-changes-frostivus/ http://blog.dota2.com/2014/12/future-changes-frostivus/