If that is indeed true, there was no excuse, movie or not, to sit on the release for over a year, especially since we already had to wait 2 years for it to come out. For the 1000000000000th time, there ARE 5 seasons, re-releasing the movies, Muppets Tonight, prospects of complete series sets and individual disk best ofs. There's NO reason any of those couldn't have promoted the film the same way, especially since it was announced at the D23 that it WAS coming out last year back in 2009.
So far, we've seen everything else they announced, the Uglydolls, the Cat Cora thing... but no DVD set. Again, movie or NO movie, unless there's a rights hold up on another front, there was no reason to drag their feet. These things actually sell, unlike the just released sets of sitcoms that haven't even had the chance to get on reruns by the time they come out. Or bad Food network shows.