I don't really have an idea about all of the corps, but I can make a guess about first. I believe(more recently) the Blue Devils work in cycles. Take 08-10 for example:
08- Very demanding show, comes up short.
09- less demanding, more accessible, and the corps dominates all season.
10- Extremely demanding, but achievable due to the immense talent drawn in from 09.
I think 15 is the end of another type of "cycle"
13- Demanding show, came up short.
14- Less demand, but no one else came close in execution.
So for this next season, I think the Blue Devils are going to draw in a ton of fresh talent coming off of an undefeated, record-setting season. I think they will do something incredibly demanding, and perhaps edgy in design, that will be like another 2010. You may not like it, but you can't deny it.
1. Blue Devils