User blog comment:Dogvscatman123/How powerful F8 items may be/@comment-32112211-20180112034735

I'm pretty sure that floor 8 is going to be another floor with enemies. So you're guess on the Uncommons may be correct. However, I doubt that there will be a new shop floor any time soon since after every 5th boss is a shop floor.

Floors 1,6 and maybe 11