As someone who is a part of the roleplaying community, I would love more costume pieces. Especially if we get some more 'normal' clothes, too. On top of that, the greedier side of me would like to see more body types and more emote options, both for specific body types or otherwise.
Outside of that, the highest priority would probably be to do an art update, both on older CoH content and CoV content. After that, I would just love more power pools and side pools, and if MMs got more love I would probably cry. Everything else, for me, would just be icing on the cake.