Although Microsoft have the right to say what gets released on the XBLA, developers have the right to say when (well... mostly) and I don't think ANYBODY would want to be released this week - being the release of Grand Theft Auto IV. You can bet your dashboard will be filled with GTAIV advertisements (in another case of advertising for a game that doesn't need it)

Still need your XBLA fix? Go back and buy Switchball or Gripshift, because I know damn well you didn't buy either of them damn it! Do it!