The committee has voted, and (as things stand right now) GHC2024 will be GHC2021 plus
DataKindsDerivingStrategiesDisambiguateRecordFieldsExplicitNamespaces-
GADTs(and the impliedMonoLocalBinds) LambdaCaseRoleAnnotations
You can see the full tally at https://github.com/ghc-proposals/ghc-proposals/blob/joachim/ghc2024/proposals/0000-ghc2024.rst#2proposed-change-specification