According to Gamefa, leaker Dusk Golem revealed that the DLC for Resident Evil: Requiem might bring back Spencer Mansion. This claim has not yet been officially confirmed, and the mansion's return remains a rumor.
Spencer Mansion is a location featured in the original Resident Evil. According to this leak, players might be able to revisit this mansion in the additional content for Resident Evil: Requiem.
Dusk Golem claimed that this area was originally content created for the base game of Resident Evil: Requiem, but was cut before the game's official release, thus not making it into the final version.
He stated that he has currently heard this part has been selected, with the development team preparing to use it for the game's DLC. However, related arrangements may still change as development progresses, so it cannot be determined at this stage whether Spencer Mansion will definitely make a comeback.
Prior to this, there were also reports about parts of Resident Evil: Requiem being cut. Including this DLC claim, none of this information has been officially confirmed, and should currently be treated as rumors.