Sorry I couldn't tailor this down to a few options in a poll. (Order means nothing; was simply the order I thought of them in)
1. Superior graphics; this game is more than worthy of having blockbuster visuals.
2. More interactiveness; houses that can be burnt down, impact (hitting a wall/person actually does something legitimate), more things in maps which can be interacted with etc.
3. More customization; instead of having simple weapon variants, I would like being able to customize and create your own weapon made from various parts which all affect stats and visuals. More stats to and skills which can be customized (strength, agility, dexterity, speed, endurance etc.)
4. Different fighting style; instead of feinting, attempting to kick and pausing attacks, I think a stamina system should be implemented. Attacks would take up an amount of stamina depending on your ability to use it (governed by your required attribute and the value of this attribute) and the size of the swing. Feinting would take up an extra amount of stamina, as would sprinting (new feature should be implemented; sprint rate should be affected by speed, sprint stamina cost rate should be affected by agility+dexterity+speed), jumping and blocking (both holding the block and blocking the impact, cost would depend on endurance, strength and block efficiency) there should also be a new bashing feature. This bash feature would be similar to kick but it would be much faster, cost less stamina but have shorter reach and a less significant impact. Kicks should also be greatly buffed in speed, distance and general usefulness.
These additions to combat would greatly change the way in which the game is presented; people would be more likely to flock to the game in that it looks like a blockbuster but still plays as well as the current game; it would also look more realistic in practice.
5. More complexity; siege weapons, more tactics etc.
6. Better gold/xp system; I know this is one of your priorities so I will say nothing further.
7. More balance; each archetypal class should generally be as effective but should be effective at differing things.
8. More gamemodes; obviously the various typical ones (team deathmatch, free for all etc.) would be included but this game could benefit from various other game modes being added.