Yes, at one point or another you'll be able to either purchase or get free skins. Those will most likely be compatible online. It's just a waiting game at the moment on the other hand I am very addicted to this game even though I have it for the PC, I enjoy using my control
It would be hard to do since the game has already been made and they aren't already in there, but they will most likely come out with downloadable content skins, or I think it would be cool if there was an app on the market place that you could use to create and customize skins that you could then import into minecraft.
Will minecraft for the 360 come out with....