Originally Posted by
Endus
It's a bit early to say, but the idea with the change in the talent trees originally was to take all those passive talents, and either remove them across the board (meaning everyone sees a roughly similar reduction), or bake them into the spec passives or the abilities themselves; Lava Burst becoming an Ele/Resto ability only means they could just reduce the cast time on it directly, rather than having that reduction be a passive in Elemental's tree, for instance.
There's also the issue that certain classes will be more reliant on their level 87 abilities and level 90 talents than others, for DPS purposes. Shaman, for instance, are missing out on Ascendance at 87 and their level 90 talents, which are a solid DPS increase as well. Mages, to pick a counterexample, only lose Alter Time at 87, which is mostly a defensive CD, though their level 90 talents will be pretty integral to their mana regen, too.
It's definitely going to shake things up, but exactly how the chips will fall I don't think anyone's really looked into.