I'm salivating at the possibility of a classic RE that is even better than REmake.
Initial wish list:
Bring back defense items with a manual and automatic mode.
Bring back Crimson Heads.
Do cool stuff that messes with veteran players (example in REmake being the dog hallway). One idea I have in mind would be the room with the one way mirror.
Like the recent REmake Remaster, allow costumes of Leon and Claire from recent games.
Gather all of the bonuses from every version including EX files, the minigame mode, and Nightmare difficulty from Dreamcast/XP.
If it's the 20th anniversary release, include an emulated version of RE2 as a bonus.
A mode akin to Once Again, Real Survival, Invisible Enemies, and One Dangerous Zombie.
This is all off the top of my head.