Officially announced, Valve is working on DotA2, which will feature all the same hero's from DotA.
From the looks of things, Valve wants it to be more player friendly for noobies with their "Coaching System" More details are yet to be released but the Coaching System will apparently reward players with special rewards for good coaching rep. The way it would work is the coach will be a assigned to a player, and they can privately tell them things, where to go, items to buy. The coach will also be able to see everything the player sees.
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