Just a matter of days ago, we had generally no idea what Dota 2 played or looked like, and now Valve has posted full high definition replays for most of the Radiant vs. Dire matches from its "The International" tournament going on at Gamescom. Just click "View (Replay)" on the tournament match page to watch. If you turn up the resolution and send it fullscreen, it's almost like you're actually playing the game.
The video confirms most of what we knew about the game itself: It includes "denying" (which DotA successors like League of Legends have tried to eliminate), all the old heroes are along for the ride, and it generally plays just like the old DotA, though with much better graphics.
Not shown in the videos are the game's extensive social features – that will apparently have to wait until we can get ourselves into the beta and check them all out.