-Incremental level cap. I'm sorry but its necessary. If everyone can get to level 100 in the initial campaign then everyone level 80-100 will whine about how there's no high level content and how easy everything is.
-Abolition of the customization system or at least the option to uncustomize.
-Better AI for our "Companions" and better controls. Hero AI is really annoying and they often do things you don't expect. Companion AI needs to be a huge step up and the controls should have a few more options.
-Smaller areas in the persistent environments. Large persistent environments make getting places harder and make the likelyhood of seeing another group small.
-Loot scaling in high-end instances. *lol* It would be helpful because if 12 people(that should be the limit in dungeons) are hacking away at a monster the loot shouldn't go to whomever loots the corpse first. Instances with more people will get more loot and don't you want more people in difficult areas?
-more generic skills. I really like GWEN's PvE only skills. They add utility to every profession thus giving everyone more versatility.
Do Not Want:
-the current form of Survivor. It stinks and needs to be fixed.
-Penny-ante reputation grind. I'm tired of killing foes to get 1 rep point when I need thousands of points to get to the next level.
-low end vanity armor: I kinda liked having some fuctionality built into my armor. Insignia give you greater versatility but they can be too expensive for the beginning player.
-the current storage system. Its been vastly improved but could still use alot of work. Armor storage is a must!!
-Hero battles. They're dumb. *lol*