(Jason LOVES Star Wars, from what I've heard).
Hmmm, maybe Jason Segal should write and star in the next Star Wars movie....
I noticed in that shot where Walter takes a bow, and we see a little of the orchestra, that in addition to Lips and Trumpet Girl, we see a few additional characters in the orchestra, who I don't recall seeing before. There have been quite a few instances (especially in season three of The Muppet Show) where some random one-shot whatnot musicians were in the orchestra (I think It's a Very Merry Muppet Christmas Movie also had some extra orchestra musicians, besides Eugene, though I can't remember what they look like, since there's no good wide shots of the orchestra there). But I noticed one of those whatnots appears to be holding a baton. Which would mean that while Trumpet Girl is making a comeback, Nigel won't be conducting (I doubt it'd be a plot point, but you never know). What a shame.
If Wayne and Wanda get any dialogue, I wonder who'll perform them. I suppose David Rudman would perform Wayne, but I don't think any performers were trained to take over Eren Ozker's characters (Janice doesn't count!). Though I think it would be a bit fitting if they were to get introduced, and then the act ended before they could even get a word out. Then again, there are quite a few Wayne and Wanda numbers where only Wayne (or only Wanda) gets to sing.