There's a closed , very private beta going on at the moment for Valve's upcoming click simulator DotA 2. Or, at least it was private: one of the participants has apparently leaked the client data onto the internet, spilling all kinds of information on the game.
Among the content currently out there are character icons, backstories, menu screens and mention of game modes (Single Draft, All Random, Random Draft, Captains Draft, Captains Mode, Death Mode, and Easy Mode).
There are also spell icons, though note that many of these are either unfinished or are (amazing) placeholders.
Interestingly, it seems some of the beta's code contains mention of a free-to-play mode for the game, similar to that being used by Valve's Team Fortress 2.
For audiophiles, there are almost all of the game's audio files, including seemingly endless b-rolls of each character's soundbytes, some of which you can hear in the gallery above.
My favourite, though, is the clip up top, showing that Valve is kicking the game off with a new company intro reel. That's creepy as hell.
Note that while there's so much content out there, none of this is confirmed as being from the game. We've contacted Valve for comment and will update if we hear back.
Character Models [gameranx]
Character Backstories [playdota]
Spell Icons [cyborgmatt]