DC is correct. They are in fact remaking those titles.
Here is a trailer for the Resident Evil Revival Selection (Note: it's in Japanese). It's a comparison of how the graphics have been remastered. It's not a huge makeover, but I don't think
people really care, I think it's the fact these classic titles are actually going to be playable on the 360.
here is the confirmed achievement list for Code Veronica if you're interested. Resident Evil 4's list hasn't been announced yet, as far as I know.