OMG this is amazing.
Question: what kinds of API/community features are going to be included? Just comparitively, Steam has (*deep breath*) achievements, trading cards, profile badges, mods, workshop, DLC, dedicated forums per game, screenshot uploading, stat tracking, (*out of breath*) and more. Are we going to see anything along the same lines? Maybe a trading card game that's more than fancy coupons, like something Triple-Triad-esque?