Graphics are a problem.. :) Trouble is they take a lot of investment and time (and a good artist), and the priority is adding a number of game features first. The next version of SO is very likely to still be 2D. But hopefully the graphics will be improved. 3D is then something that will be looked at along with other things. Still haven't received my copy of GR (should have been here days ago) but I expect it will be a game with a different emphasis from SO.