This is Kameo on the Xbox360. The picture on the left is the game running in standard resolution and the pic on the right is running in HD resolution.
When you blow the image up and compare the two yes, you can see a bit of a difference in quality. However at a distance the HD doesn't really look all that much better. You can tell that the standard resolution pic is not running on S-video either. I don't think we will be missing out on too much in graphics with the Revolution besides maybe a few blades of defined grass.
Is it worth the extra price? Thats a big maybe. However, I've compared a lot of S-video and HDTV and only up close can you tell a bit of a difference.
So, the Revolution is most likely going to look like the pic on the left. Are you disappointed?
Me? Not at all.