I was on the Crown in JULY.
The 5th floor of the atrium is different. There is a coffee bar/international caffe on one side (with free chocolate chip cookies and other treats), and the Vines restaurant (a small cafe) on the other side. The most interestint thing is that there are little 10 minute shows about every 1/2 to 1 hour during the day when you are at sea. The goal is to make the atrium a little more active during the daytime.
The 6th floor is the pursers and excurisons desks, as normal.
It was a great place to relax for a while if you can't take sitting out in the sun all day or want something a little different.
Have a great trip.