found this on an ok rally fb page. more of the same but eh, its looking like this is it...?

This is the proposal made to the teams during the Japan rally that will be approved during the next FIA Motorsport Council on December 11: The 2027 technical regulation will open up to all types of engines and each manufacturer will be able to choose the one they prefer to develop their cars among:
•Combustion engine (powered by 100% synthetic fuels)
•Electric engine
•Hybrid engine (all forms of hybrid, including hydrogen).
The performance of each car will then be leveled by a torque meter that is already used in RallyX and that is working well.
A sort of balance of performance that becomes necessary in a championship made up of cars built in a totally different way.