Taking a look into the Doom + Doom 2 that was announced and made available I've did some research on what makes it different.
Aside from running on the KEX engine from Nightdive Studios, it has a new modding architecture standard as an alternative to Boom, MBF, and MBF21 that is also implemented in Doom + Doom 2:
the ID24 Architecture:
https://doomwiki.org/wiki/ID24
Some notable features such as:
Music Changes - music line specials that can change music on the fly without changing levels
or New Monsters (3007, 3008, 3009, 3010, 3011, 3012, 3013, and 3014)
ID24 also has the ID24HACKED (https://doomwiki.org/wiki/ID24HACKED) specification as part of the architecture which includes the following as a subset based on some DeHackEd features:
- [DeHackEd]
- [Boom]
- [MUSINFO]
- [MBF]
- [DEHEXTRA]
- [MBF21]
- [DSDHacked]
The new Legacy of RUST wad in Doom + Doom 2 makes use of the ID24 and ID24HACKED.
One thing to point out based on the Doomwiki is that "Neither the specification 'ID24 0.99.1' nor Doom + Doom II at release are fully compatible with Boom and MBF21 standards, this is due to it being a cleanroom re-implementation. The finalized spec will follow soon."
Aside from that, maybe WhackED could be updated to utilize the new ID24 and ID24HACKED?