After viewing Rise of Skywalker I feel like the new raid is going to be a Palpatine raid.
Phase 1 being a ship battle against the death star.
Phase 2 being a battle between Palpatine and Vader (episode VI scene)
Phase 3 being a ship component against the sith ships in episode IX.
Phase 4 lastly being a final confrontation with a super charged Palpatine. (Episode IX throne room)
The rewards will be something big.
Either a full on Sith Lord Palpatine, Jedi Luke, Master Vader, a ship,, ect.
Probably will be equally as or harder than LS GEO TB.