There are a couple things I would like to see more of:
1) More touching! I know I'm saying that awkwardly, but my favorite part of yoga class is when I get adjustments, because then I know I'm improving my form, or when the teacher helps me get deeper into a pose, more when a teacher helps us relax in savasyna.
2) more weekend classes that are not in the morning. Like a late morning/early afternoon power class. My friends and I always talk about how we wish this existed.
3) some morning weekday classes that are around 8am. I know they're all at 930 probably so that moms can come after school drop off, but for me, I work late (doing after school therapy) and 5am is just too ungodly early for me to wake up, and waltzing into work past 11am makes me look like a terrible professional. Something in between would literally change my life.
4) Bring back the yin class! That was my favorite.