3 weeks late to this but I'll chime in anyway.

Communities Feature. - Long overdue. There is very little sense of community on Steemit, even within niche circles.

New post types, such as polls, playlists, galleries, Q+A, etc.

Address the issue of unnatural voting. I don't know how but it needs to be addressed.

Improve the homepage to be more fun, dynamic and give minnows a helping hand. Have featured posts, editors picks, wildcards, etc.

Make Steemitblog and other "official" entities less faceless and impersonal.