Are we going to see his role expanded in this remake, just like with RE2? I don't see why not. I think it would be a huge missed opportunity not to have him partially conscious during Jill's visit to the RPD, especially since they already have his character model for the RE Engine. It would also help bridge the two remakes together even more by having a character model appear the exact same way in both games.
Story-wise, it wouldn't break anything. I could actually see Jill interact with all of the remaining police officers before they die at the RPD, including Elliot Edward and David Ford. Perhaps she would even consider helping them with finding the secret underground passage before Nemesis surprises everyone and starts chasing Jill away.
So far though, we haven't seen Marvin in any promotional material for the RE3 remake, except for this fake image made by some idiot who really sucks at photoshop:
Spoiler: I made it.
Story-wise, it wouldn't break anything. I could actually see Jill interact with all of the remaining police officers before they die at the RPD, including Elliot Edward and David Ford. Perhaps she would even consider helping them with finding the secret underground passage before Nemesis surprises everyone and starts chasing Jill away.
So far though, we haven't seen Marvin in any promotional material for the RE3 remake, except for this fake image made by some idiot who really sucks at photoshop:

Spoiler: I made it.