As we suspected with leapfrogging design teams, Navi is this year for the mid range, Vega's replacement is next year for the high end. Something I don't like seeing is the word "watercooled", so it's likely AMD's TDP will be, well, insane.
https://www.techpowerup.com/255768/sapphire-reps-leak-juicy-details-on-amd-radeon-navi