The fourth and final Cinderella Castle turret has been unveiled at the Magic Kingdom. This actually the second of two show control booths that are on either side of the castle. The turret/show building in question is on the left side of these panoramas.
There is still plenty of work to be done, but at least the scrim is down.
Check out how well the control booth, turret, and castle blend, thematically.
Here’s a look at the left ramp.
And the right ramp.
Full size: http://i.imgur.com/KlUU04y.jpg
Work also continues in the northwest side of the hub. Looks like this could be completed and opened shortly.
Full size: http://i.imgur.com/y4SuHPT.jpg
Hopefully this gives you a good idea of the work currently being done. There has been no official end date announced.