They talked about an dps, healing and tanking tree for each class. Not sure how this should work, Sorcerer can be decent healers and tanks but uses class skills all over.Assuming they follow the guidelines we will have a base game update in Q1 2018
There have been whisperings of a big class balance pass, so that might be it, or we might get spellcrafting. Who knows.
Q2 looks to be the Summerset Chapter, though nothing is officially confirmed yet.
Q3 will be another dungeon DLC
And I'm guessing Q4 will be a Daedric Realm dlc to the same scope as Clockwork City.
None of this is official and we will have to wait until the 2018 road map to be sure