Crossing my fingers on the crafting process. I was a huge fan of the SWG (Star Wars Galaxies) crafting and resource side of things.
For those who don't know, nearly everything was craftable by players in the game. Some crafted items required components that were crafted by players (some even crafted by players of different skills, IE a tailor could craft padding needed by an Armorsmith to make armor). Each component or finally crafted item needed various resources to make it work (different kinds of metals, wood, furs, and grains). Their was a variety of each kind of resource, each with its own stats that fluctuated from time to time. And while you crafted your item you could experiment on them to attempt to tweak certain stats. Therefore, two weaponsmiths could use the same exact resources but experiment on different stats to make two weapons of the same type with slightly different stats. Or, they could use different resources to make the same weapon with vastly different stats.
I would love to see resource harvesting. Example, mining mithril or adamantine. Depending on where it was mined from it would have different base stats that could increase a weapon's damage, or its swing speed, or hardness and hitpoints.
*Edit*
Also borrowing a bit from SWG, I'm hoping the settlement system will allow player built cities to elect officials to help improve the look of their cities as well as impact the area directly around player cities. The community aspect that SWG created seemed unparrelled.