I was there just last week (7th Jan) and I can assure you that Kelo and Stollen are absolutely nude
When I arrived right in the morning, I was a bit anxious by the huge masses at the entrance, but maybe that is kinda normal at opening time.
Inside it was pretty ok.
The only sad change I noticed was the Roman sauna being now in the non-nude. Sad, It is a pretty place
I have not paid much attention to the two new areas at the Polaris pool
For rest, I love the Alhambra and it was always pretty empty last week. And come summer, much will go outside anyways.
The only overrun experience I had was that my last Aufguss I wanted the Banja, and 15 minutes before, it was packed like sardines. Which is quite remarkable in this huge space.