His comment about Rockstar putting off GTA to work on MP3 is stupid. Not even the same dev studios. Rockstar Vancouver handled Max.
You must have missed the announcement when it re-emerged:
Source: http://www.neogaf.com/forum/showthread.php?t=426270Edge said:-Vancouver, London, Toronto, and New England R* studios are all cooperating on this title.
Rockstar Leeds also heavily worked on the project, bringing it up to five studios.