You can see the release here for pitlord
in a 10 v 10 all stars game.
Just a fyi, no new hero has ever been released into Dota 2, this is a first! They have all been ports from the original Dota that was a mod on warcraft 3.
let the hype commence! Oh ya, did i forget to mention the international final is on tonight with a prize pool of $20.6 million dollars, crazy i know!
You can check it out here - http://www.dota2.com/international/overview/