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The release plan for DotA 2 has always been to develop it slowly in beta, eventually putting the whole thing out when it's officially done. "Our original release plan was dumb," developer IceFrog writes in a new post on the game's blog. The new plan? Deliver DotA 2 as quickly as possible.
The blog update blames overeager fans for the change in plans. It seems that people are just too damn excited to play this Defense of the Ancients sequel, and so the beta will be polished off and released with the promise of many more features to come. The beta is going to stay invite-only for the next little bit, but the plan is to get the game out "as fast as we can."
Source: Dota 2 blog