The original leak on
June of 2023 stated:
It is done currently using a pairing system, so it means that the remaster is running using both an Unreal Engine 5 project, and the old Oblivion one. For instance, new graphics are rendered in the UE5 project, but most of the gameplay/physics/etc is still done in Oblivion. It should be released end of next year/early 25 depending mostly on if it's a remake or remaster.
This sounds like whoever wrote this was not technical, at all. What this sounds like is they had two projects running. The UE5 version of Oblivion and the Creation Engine version of Oblivion and they had not decided on whether they were doing a remaster or a remake.
A UE5 version of Oblivion would
require a remake from the ground up, while an updated version of Oblivion in the Creation Kit would simply be updated polygon counts and texture size increases. From what we can see from their marketing material, they chose to complete a remaster instead of remake.
The whole reason why Virtuous considered rebuilding it in UE5 was because if they tried to change anything in the Creation Engine version, it'd likely all fall apart like a house of cards made out of wet paper. The Creation Engine is a terrible tool for building games. It has memory leak issues which the community has had to patch and frequently crashes.
There's two major reasons why I think BGS continues to use their outdated engine.
1. Training everyone to use a new engine would take time and resources away from making new games.
2. UE5 takes a 5% royalty of worldwide
revenue.
Anyways. It's a remaster, not a remake. And it wasn't done in UE5. No idea why they needed 100GB. Hopefully the performance isn't terrible.