i know that domestication of animals, animal breeding, and more item drops from animals is planned. Also a cooking system.
Now lots of fans here (myself included) have made suggestions for a leveling system and a skill tree system. While Red51 seemed interested in the ideas, nothing official was ever announced. At minimum, there will be a system for clothing and armor to offer protection from impact and extreme temperatutes. Fortunately with dungeons now just days away, player models will be the next big update so we might get some more info about the player models real soon and maybe some screenshots. 
I've heard lots of good things about Wurm unlimited but from what I understand of the game, that level of crafting complexity might be beyond what I would expect from Rising World. But who knows? This is an alpha game and there never was any guarantee that the game will be anything close to what it was when it first hit Steam. I guess we shall see. I would like to see harvesting, crafting, and construction in Rising World be a little bit more complex than it currently is but something that mimics Wurm might be a bit too extreme. I just dont want to spend all day building a boat and worry about what my sucess rate is of hammering a nail into a board. 