Well the first thing is that they went from 256x256 bitmaps to 1024x1024. So all the planes have to be skinned at the better quality. And all the terrain tiles, etc.
That will actually cause a bit of an improvement in the overall look.
Alot of the beaches, cliffs (white cliffs of dover on BoB map) etc. will built into the tiles.
But I am also hoping for more 3D objects or control over trees, hedge rows, etc.
Would like to try to redo the ocean also.