I'm not believing anything until @jfiama19 comes forth and says Kevin did indeed return to the Henson Company.I heard that he was involved with the recent auditions JHC is having. But even so, I don't think they'd make a big thing out of his returning in fear of bad press considering you-know-what.
That's good news. Maybe he'll return to play Clifford or Polly Lobster in a Muppet project at some point, maybe even on the TV show. You never know.