When the official Kodu blog mentioned that the title would be available this month, it apparently wasn't lying. Xboxic is reporting the game will be available for download on the last day of this month, June 30, for a reasonable 400. Oh, and if you're scratching your head due to Microsoft's penchant for Humpday releases, remember this is an Xbox 360 Community Game Indie Game, and not an Arcade release.
For clarification's sake, we've put in word to Microsoft to confirm and will be sure to get back to you with what we find.