particles upgrade
pynodes
ogre plugin for ge
custom bindings/toolpipe/script recording etc
image browser
bmesh/ngons
verse
motion tracking/match moving
cloth
very solid support for industry standard importers/exports (Collada and FBX)
sculpt upgrade? (editable multires; higher polycounts; tangent normalmap baking)
switch uv tools to use editmesh? (ie so all editmesh tools can be used on uvs)
fluids upgrade? (flow into shapes, large areas, etc.)
fast easy automated unwrap if the user hasn't unwrapped already and is in paint mode
automatic linking of the texture so that confusing linking doesn't have to be done