this seems to make very little sense. most of the custom ROMs out there are based on Samsung's leaked 2.2 ROMs. If Samsung really didn't want to send out official updates for 2.2 they could stop the leaks and would kill XDA updates.

Also judging by the updates trickling in, there is still a lot of work being put in by Samsung to makes these ROMs stable. Almost every leaked ROM has issues. lag fixes and gps fixes on XDA seem to be the norm to work around them