In an interview with MrGM a couple of weeks ago, Game Director Ion Hazzikostas revealed that Legion Mythic+ Timewalking won’t be returning starting in 10.0.
Ion Hazzikostas
Will Legion Timewalking still exist with ?
No, it won’t once we get to 10.0. Legion timewalking, the mythic+ piece of it was an experiment that helped validate this on a larger scale.