I haven't seen, but could only imagine that for ut2007 that the maps will be capable of being even larger than ut2k4. Also, I don't think it is possible to do this in ut2k4.
It would be cool if orientation on a surface is based on gravitional pull no matter if in the x,y,or z direction or a combination of all three. I'm thinking like a point source that radiates its mass to create a gravitational pull upon itself, or a mechanical tractor beam. This pull obviously detiorates functionally with distance. I think it would be cool to actually create orbiting masses and so forth in ut. And be able to create your direction of view based on the gravitational pull. Also, would be cool to make masses very extra dense so it doesn't have to be huge to have a gravitational pull.
Is it possible in ut2k4? I'm thinking mostly of a spherical surface like a planet.