I'm playing 4e right now as a bit of an experiment. Let's just say we have had to add a lot of House Rules to make it playable but there are a few aspects of it I like. I think the game I will run will be a 3.x house rules hybrid that will include some 4e traits as well as some traits from other versions of the the game.Like many, I don't recognize 4th ed. although DDO seems to be heading in that direction. Update 23 will probably introduce us to daily powers and such (just guessing lol).
As for having that stuff in DDO, we don't have to wait for Update 23, its here already in the form of EDs and now some Enhancements.
4e has a number of abilities that were based on "succeed (or sometimes fail) at using XXX ability/feat/attack #### times and you get to use superpower y". We have LOTS of examples of that in game.
As for the once/twice/three times daily powers, we have a near endless list of them now as part of ED/enhancements.
And encounter powers, what do you think those feats/abilities with 3-5 minute cool downs are?
Nope, we have been steadily moving to 4th Edition for several years now and in many ways it has arrived.