A terrain system with more flexibility would be nice, like;
An increased number of LOD levels,
Being able to control what the maximum / minimum LOD level is,
A map which will set certain quads to not update past a certain LOD level, or to stay a certain LOD level (useful for buildings in the distance, so when you zoom in the building isn't floating or buried),
Being able to set which areas are visible by a command, instead of just by the editor,
Cave maps, River maps, Road maps,
Increased amount of textures....which I think is already planned,
Do I dream too big?