Capcom is already working on a remake of Resident Evil 3: Nemesis, according to ResetEra member DuskGolem.
Recently posting in a thread discussing the upcoming Resident Evil 2 remake, DuskGolem revealed that a remake of the 1999 survival horror title ‘is in full development right now,’ but wouldn’t comment any further.
Dusk Golem states: ‘Resident Evil 3 Remake is already in development. I hope Code Veronica happens as I do feel it’s the RE game most in need of a remake, but RE3 is the last mainline RE game that needed a version for easier porting in the future (RE0, RE1, RE2 (after REmake 2 comes out), Code Veronica, RE4, RE5, RE6, RE7, Revelations & Revelations 2 all have versions on MT Framework and RE Engine that be ported to future consoles, only RE3 is missing after REmake 2).
DuskGolem does actually have a successful track record when it comes to leaks, this includes details on the Not a Hero DLC for Resident Evil 7, and to add fuel to the fire, Capcom has said that it would consider the possibility of more remakes after Resi 2 comes out.