I've droned on about this before, but Blu Ray release of Worcester would be a holy grail for me. From what I can tell the show was recorded on film, and the whole show appears to already have been miced by Brendan... So it's just a matter of them scanning it in HD.
My expectation for a 25th release for Purple, if they do it, would be something like this:
Disc 1: Original Album Remastered
Disc 2: Demos
Disc 3: Live from Worcester, MA
If they wanted a fourth disc they could throw KROQ Almost Acoustic XMAS 1994 in there, but I'm concerned that microphone feedback in the recording might stop them from using it.
I don't see them doing a surround mix for it, since they just reused the 2000 mix for Core, and there really are no B-sides to speak of for Purple.