While overall don't have anything to really complain about when it comes to the Power System, a couple things I would like to see are:
-A nice way to mathematically/mechanically improve a Power if you decide to forefeit some portion of it, ie: A hit then heal Power, some mechanical improvement if you decide to only heal.
-Some mechanics for introducing Powers more specifically to Skill Challenges, ie: A power that allows you to slide how would using that influence a chasing Skill Challenge.
While these can be house-ruled, be interesting to see what
WoTC could do with it.