I forgot about this and didn’t get to watch it live (I had a few questions, though it looks like those were answered after all).
People on the Toughpigs forum were hoping each episode would be more an excuse for the band to perform, with minimal linking plot. Looks like it’s not going to be that.
I figured other Muppet characters would appear, though I don’t know what extent it will be, like if many others are just as major as the band (like bringing Scooter back to his role as road manager, or maybe having Pepe manage the band…. Perhaps Fozzie could go on the road as their opening act). I feel it would be better if the presence of other Muppets was more like honorary guest appearances, like how the adults were used on Fuller House (though I have only seen the first season), or maybe similar to how Muppets other than Elmo appear in the old Elmo’s World (at least two cameos by other characters per episode).