We weren't staying at OKW, but went to the resort on 1/2 and rented a boat. Here's what we could see of the changes from the boat and from the small gaps in the wall.
The end of the pool without the slide looks the same as before. The end with the slide looks pretty much the same too except the castle is sitting on the side where the steps were. The bridge over the pool is still there. The lifeguard's chair was positioned in front of it on the slide side. The sand castle is huge. It looks to be in the spot where the kiddie pool was before. We couldn't see if they added a kiddie pool that was hidden by the castle. The smaller castle with the play area, the hot tub and the sauna appeared the same as before. The dolphins are still where they were.
My camera was not charged, so I couldn't take any pictures.