What I most want to see is high quality characters - stuff that’s as good as or better than the Mixamo characters that were put on the Marketplace (which btw are , thank you Mixamo and Epic!). Having more characters that are of the same quality bar as those would seriously rule!
I find that environmental art tends to be pretty high quality in terms of what’s on offer as packs, but characters seem to be stuck in a little bit of an older-school quality bar than what is typical in modern games in terms of triangle count, resolution of maps, complexity of rigging etc.