A thread on NeoGAF attempts to round up all that was found in a data mining expedition through Valve's Dota 2 beta, which has apparently leaked onto the internet. This includes some sounds, artwork, lore, and more. They also look through data structures in the MOBA beta finding indications the game will have an item shop, hats, a killcam, a "newbie detector," and more. Some of the data therein are being interpreted as indications of future projects, including what may be references to Episode 3 as well as a space game, though it's not clear why such things would need to be in Dota 2. None of this is confirmed, of course, but there is also an updated Valve logo and a video showing the beta that seem strong indications that this is not based on nothing. On a less speculative note, a story on the South Oregon Mail Tribune indicates Valve is at work on a documentary about e-sports, focusing on Defense of the Ancients. Thanks Steven.