To be honest, I'm not interested in another concept album. It'd be ok if the album had some recurring lyrical themes in different songs, but I think the idea of one huge story running throughout the album is overdone. And if they did a story-based concept album, it would be compared to Scenes all the time and probably overshadowed by it, with comments like "the new album is good, but not as good as Scenes".
When it comes to song lengths, I hope the new album will be closer to the 90s albums and ADTOE than the last few albums with MP. I prefer albums with more concise songs and maybe one or two 10-13 minute epics. I love ACOS, but I think DT's attempts at huge epics on the later releases haven't been nearly as successful - most of these overlong songs have parts that could've been cut away.
I think we won't be hearing any mega-heavy stuff; Jordan has said he's not a huge fan of that kind of music and in many interviews James and JP were saying they were really happy with the balanced style of ADTOE.
All this probably makes people think I'm not a prog or metal fan!
I just want a balanced album with a good mixture of heaviness, complexity, atmosphere and simplicity.