I suspect the thunderbolt display doesn't move enough units to be a high priority. Apple never updated it to match the imac design, which I originally thought they would do 6-7 months after the redesigned imac rollouts. I don't see the cinema display on their site now, and it didn't come up in a store search for "cinema display". It may still show up in refurbished form.
4/3/15 at 12:44pm