When Kermit goes searching for the other Muppets, I wonder if any of them will hesitate working with the Muppets again? The miniseries should have some conflict. I imagine that Sam the Eagle would not be thrilled with working on another Muppet Show. Would it be better for most Muppets to jump at the chance to star in another series, or for some characters to not be interested at first?
I think it would be good if Miss Piggy got a better job outside of the Muppets. Maybe she can have the chance to star in her own movie or series, or something else that would make her more famous. This could cause her to resist appearing in a new Muppet show. Kermit and the gang could constantly try to find ways to lure her to the new show, and maybe it wouldn't be untill the end of the last episode when she finally accepts.
Another idea would be for Pepe to get a job as assistant manager at either a strip club (though Disney might think it's too much for a Muppet production) or Hooter's (or a similar resturaunt). Obviously, it would be hard for Pepe to give this up (he could say that he makes more money and sees more hot women than he would working with the Muppets). Pepe could get fired for sexual harrassment, and then become part of the new series.
And maybe somebody could want to be on the show but have a contract with another company, preventing them from being a part of it until later.