There was a lot of debate about this. I was instantly turned off by Torghast because it reminded me too much of rifts. I fielded criticism that it had nothing to do with rifts, well, now we have official confirmation that WoW devs specifically consulted D3 devs to get insight on designing Torghast. So there is strong rift influence in its design and likely going forward with the game mode.
Definitely not buying SL.