i think adding in a few obstacle avoiding scripts and power management would be cool. everyone should keep in mind that this is dumb down content that is still to be tuned so be specific on what you ask for or they might do a VP2.0 that no one will be able to kill.
add in mini-games imo.. maybe like a simon says (like goblin minigame) sure it's trite when that's all you're paying attention to but in the middle of an encounter it's a a different story. have it port the player to another room maybe and they have to kill mobs in a certain order while they all beat on him. if he fails then it will be a huge penalty for the raid. like damage reduction placed on the mob or hp boost.
personally i'd like to see more mobs that require actual healing forcing healers to spec for every single healing AA possible and not be able to do a lick of damage. all too often there are healers thinking their damage parse is impressive when in fact your group being alive is what is most impressive and what makes a good healer. that's how i play my healers anyway.
add in more tank jumping mobs like sisters that require 4 solid groups and stop the tanks are dps crap.