I bet they are going to make as few alterations to the old games as possible. Because....

1) Look how long it takes to release a remake of an older game for gba. 1 mario game every what, 6 months? I haven't really been following, but don't they plan to have most of their NES, SNES, and N64 games available for revolution? It would be physically impossible to remake all of them before an even newer gen of consoles without considerably expanding their workforce.

2) NES files sizes are in mere KB, while SNES I believe are closer to the MB area. If they plan to transfer these things over the internet, then they want to keep them as compact as possible. The concept of wireless transferring N64 episodes unchanged already amazes me, let alone any further visual upgrades to all these games.

3) How big is the Revolution hard drive, anyway?