Like I said, I haven't followed much of the story since I quit in Siege. But the storyline premise makes very little sense from my outside perspective. Like why are we going to time travel Draenor outside of a boner for Orcs and/or Warcraft 2? Why not resolve the actual lingering plot threads before setting up time travel shenanigans?
Well it is a continuation of the 5.4 plotline, since Garrosh, Kairoz, and Wrathion are responsible for WoD.
I find it quite interesting they made the players have a hand in it as well by powering week after week the artifact allowing the time shift.
Sadly you have to read the novel and the short stories on the website to really undertsand the damn thing, as usual.
In the end I think it's interesting and handled it well, just definitely not ingame and in PR at all.
And considering the trademark for the next expansion, it seems to be kinda wasted potential but whatever, we'll see.
Aslo, the time travel shenanigans are not new in WoW, and were far worse and made less sense in the end of Cataclysm either.