This is the most splendid of news. If you don't know Hero Academy, it's a turn-based, two-player tactical game from the chaps behind Orcs Must Die and if you are now wondering why you haven't heard of it, it's because it's an iOS game. Except on August 8th it'll also be a PC game, as it's coming to Steam and allowing cross-platform play. Opponents are played asynchronously, so you take your turn, inform your opponent and wait for a response. This means you can play loads of games at the same time and with its chessy appeal, you'll probably want to. I shall welcome it to my PC with a smile and, oh look, Valve have provided an exclusive team. Trailer below.
It looks like they're following the iOS route of having every team be purchasable, with new ones added on occasion, because we're told that buying an expansion will unlock "a unique cosmetic item" in Team Fortress 2. Maybe some kind of belt or trouser.