An entirely acoustic album/tour: This doesn't interest me at all, it's just not really my thing. A couple of songs during a normal tour like they did on the ADTOE tour is fine, but anything more wouldn't appeal to me.
DT commissioned to do an entire movie score/soundtrack: This could be cool. I'd always thought about Jordan doing something like this on his own - possibly he mentioned being interested in doing it in the past - but I hadn't really thought about the whole band doing it before.
Another entire album covered: This would be fun if it was an album I was familiar with and I enjoyed, but it's far more likely it would be something else. I've never really listened to most of the classic prog bands they might do. The only thing that comes to mind that could possibly work would be one of Muse's older albums like Origin of Symmetry. That would be a little more special for me as it would be my favourite band covering the band they succeeded as my favourite.
Making a movie or musical out of The Astonishing or another of their albums: I thought it would have been cool if they did a performance of The Astonishing with guest singers for the different characters. I think that ship has long since sailed now though.
Doing another package tour: Again, this just comes down to the other bands chosen. I've seen a lot of my favourite DT tracks live now (big thanks to the I&W & Beyond tour!), so I'm not quite so desperate for evening with shows anymore, but they'd need to pick the right bands to go with them, eg. Haken and Symphony X (though I think they've toured with them before).
Other: The only other thing I can think of would be to have a tour where the setlist would in part be voted for by the fans. They could exclude songs that they can't/don't want to play live from the voting process to retain a bit of control.
Kevin Moore: Presume this is just the standard joke poll answer, but it would be nice to see him share the stage with the band again at some point. However, I don't think that will ever happen.