Resident Evil 4 Ultimate HD Edition is launching on Steam in a little more than a month. It'll have all the content from all the previous releases, some minor visual touch-ups, and all the Steam integration you could ask for. Presumably, unlike the first PC port, it'll also have a lighting engine and playable mouse controls.
http://www.gamespot.com/articles/resident-evil-4-ultimate-hd-edition-coming-to-pc-runs-at-silky-smooth-60fps/1100-6417246/