Yeah, I really don't think a
"raucous, heartfelt, nonstop, a ton of fun through time and space & a love letter to the fans." exactly screams "Telepath War!" to me. Or Shadow, or Drakh War, or any grim, action heavy setting.
Something more along the lines of 'To Dream in the City of Sorrows' or 'The Deconstruction of Falling Stars' sounds closer to the mark. Though even those have a certain melancholic tone that doesn't quite gel with that description either.
Indeed, the only "fun" part of B5 was the characters themselves, so that tells me this will be very much character focused, not about some big grand event.
Also, not to put a dampener on things; but the original actors that are still with us by definition limits the scope of what it can do because I don't think there's any way in hell he'd ever recast.
So working backwards from who's left means we'll probably be getting; Sheridan, Ivanonva, Londo, Lyta, Lennier, Lochley, (and *maybe* Bester?) I can see a tight, fun little romp with most of those characters.
I don't think it's technically a bottle show. It's just the one set, but I think it was still a new set.
I've always preferred to think of it as a three person play, that just so happens to been put on as an episode of television instead of on stage at a theatre.