Another topic I want to mention is the new End. Considering it was one of the major facets of the 1.9 update, the mechanics of the End Reset plugin will probably have to change. Currently, the plugin resets the End about 48 hours after the dragon is defeated. However, where players used to go in, defeat the dragon, and leave, they now will have to go in, defeat the dragon, and explore the ring of outer islands in search of the five End City dungeons. Finding even one of these dungeons can take hours - which many of us don't have. A week would probably be a more feasible timeline.
It's also worth noting that there is now a way to respawn the dragon using the extremely rare drop, End crystals; however, a region-wide reset would probably still be more effective.
The other thing I wanted to mention is that when the End resets, it's always exactly the same terrain. This hasn't been too much of a problem before, as the End was always more about the battle than the exploration. Now, though, with the new dungeons and terrain, there's more need for variety. I'm not sure if this is possible, but it would be great if every time the End reset, it chose a random seed to generate. This would mean that every week, the dungeons would be in new locations, with different sets of loot every time.
I think that wraps up my thoughts on the End; if you have anything you'd like to add, please do!