Not quite complete yet. How about:
A curve editor for animation
Multi framebuffer outputs. IE: Specular, Ambient, Diffuse, Shadow, GI, etc..
A way to specify dicing for eyesplits so calculation isn't wasted on the horizon areas with the micropoly engine.
A robust GI lightmap caching mechanism. IE: Vray lightcache maps, mental ray's fg / irradiance map, or Renderman brickmaps. Preferably this would have the ability to re-use calculated data then append needed detail to the maps. This workflow allows you to render a couple of frames with angles to cover the needed areas in the animation, save that map, then all the renderslaves can reuse it (Fast and flicker free GI).
Well, that's my wishlist anyway...