The International launched last year in Cologne, Germany during Gamescom. On the Dota 2 blog Valve confirmed that the teams DK and Na'Vi (the defending champion) are the first teams to receive invitations. Last year's format featured 16 of the world's most elite Dota teams, progressing from a group stage to a double-elimination playoff. A $1 million prize was awarded.
The tournament will be broadcast free of charge in multiple languages, Valve said. For more information, visit the link.
The International Dota 2 Championships [Official Site]