I expect that they'll make the timers for, say, enochian and BotD more lenient - maybe buff certain skills so that dropping enochian/BotD doesn't completely ruin you. Other than that, I hope for a bit of skill trimming to reduce the amount of buttons needed. For example, Stone III could have been a trait applied to Stone II at level 54, rather than a completely new skill. This way, I wouldn't have to keep a useless skill on my bar (or else constantly switch it out) in case I'm running content where I'm synced down.

I'd also like to see skills that, when activated, immediately switch into another skill. You can do this with macros and hotbar switching, but it's much clunkier than it could be. An example for this is the SMN's dreadwrym trance. Instead of having two separate hotkeys for dreadwyrm trance and deathflare, I'd like to see the skill toggle automatically into deathflare when DT is activated, since deathflare cannot be used outside of DT and ends it upon use. Something similar could be done with tank stances.