http://store.steampowered.com/news/5856/
I guess all the impossibilities of downloading during the last sale really has Valve getting on their game. But more importantly, last paragraph:
"Over time, more and more of the content on Steam will be delivered using this new system. Soon, Dota 2 will be delivered using it."
Granted, "soon" via Valve time, BUT STILL.
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http://www.nbc.com/parks-and-recreation/exclusives/ron-dancing-animated.gif