Admittedly haven't seen the show yet but from all the clips, it just looks sooo wrong, they just look embarrasingly awkward with the kiddie stars. I don't know how they can try to put the two together without it looking like the Muppets are desperately trying to look "hip". I think the Muppets work in sketches still, and kids and older folk alike may love them (like on youtube) but its a bit too early to have them suddenly appear in front of the kids as if they're big stars, kids dont know them. The days of TMS are long gone, give them their own sketch show set in the Muppet world or at least put them with guest stars appropriate for them but who also have some kid crossover appeal. The way this is looking, kids will be laughing at it but not in a good way.
Piggy also seems to have piled on the pounds and have some very wierd styling going on. Props for seeing the EM Band though. I can only hope the full show is a lot more like the Youtube or Muppets.com stuff.