What is the maximum texture resolution?
There is no limit on texture size in the engine. You are limited by memory on the graphics card, and the number of visible models in the scene. If your game will have lots of people on screen, all with different equipment that has its own textures (like outside the Ironforge auction house in WoW), then you will want to limit your textures (for player armor) to be fairly small (512×512 or less, probably).
