Most of the features I could wish for are already listed on the kickstarter page
As there will also be hunting and bows in the game I´d like to see a decent archery system.
I also would like to see a rather complex crafting system which would allow for crafting weapons, arrows and all kind of stuff like that in different variations regarding materials, fledging, arrow tips etc. (probably some kind of specialisation so you wouldn´t be able to craft everything on your own and further it would need trading with other craftsmen).
Not sure if there was already a post about player housing but if it´s in the game it would be pretty nice if you could build your own home.