I wouldn't lose hope yet. No one's said it WOULDN'T be seen in the us...there just hasn't been any specific announcements made of coverage airing yet. The Just for Laughs Festival is a huge event and it would be very surprising if it wasn't covered here this year.
You wanna lose hope over not seeing nifty new Muppet stuff? We have Disney's refusal to put adequate bonus features on its non-bluray dvds to get upset about. But chances still remain good that we'll see Muppets at Just for Laughs on our screens somewhere soon.