Retro City Rampage will be delayed until late 2011, citing a release in the upcoming Summer of Arcade promotion on XBLA.
Retro City Rampage is a overhead shooter akin to the original Grand Theft Auto titles, but the game takes a heavy retro perspective on the experience, throwing in game mechanics and characters and situations from a number of franchises in gaming history. Originally entitled Grand Theftendo, the game was going to be releasing early 2011 for WiiWare with other releases expected shortly thereafter.
However, in a release made this week by Brian Provinciano, the head of VBlank, the game was officially delayed for WiiWare until Fall 2011, because the game had been signed into a timed-exclusivity deal with Microsoft in order for it to appear in next year's XBLA Summer of Arcade.
As a result of the delay, however, the final version of RCR will contain added missions and content for both versions. The XBLA version will have a number of exclusive additions, though: widescreen support, video replays, a challenge mode, and character creation.
In the end, it benefits both sides. The game is fully self-funded, and seeing as Provinciano has just started going into his retirement savings, the more venues for the game, the better.
DEVELOPER RESPONSE: Nintendo World Report