-topic descriptions
-"views" on topic lists
-preview posts when posting a new reply
-the whole member profile interface
-more bb-codes [underling, colors, size, code, video, etc)
-bb code cheat sheet not in new topic section
-topic options (including polls and whatnot)
-post auto saves
-rpg banner
-Member panel (the info about the user under their avatars. Oh and avatars too).
-any way to bring back the old skin? This one is a bit sleeker and less boxy, it also blends the colors togethers more in topics with a more rounded off look. I just personally preferred original rpg's symmetrical box skin. Whatever though, if anything, re add the little line break that separates the member panel from the post. 
-like you may have heard already, page number system.