Kernel Mode Setting vs. Framebuffer?

With KMS, the graphics drivers are moved into the kernel. Since the framebuffer was already in the kernel, I wouldn't expect this to affect framebuffer operation. Yet, I read that KMS supercedes the fb, augments the fb, requires the fb, and requires fb support to be removed. What the heck? The answer I'm looking for is an explanation of the relationship between KMS and the framebuffer. I have been using uvesafb to get native resolution at the tty. My purpose here is to understand how that is going to work on a system with KMS. It would also help to cover things like.. Is scrolling faster with KMS? Do utilities like fbterm and fbida work the same? Is stability better?