Still no word on the 21.5 though (as far as I can tell from press reports).
Someone wrote that Apple didn't know that the 21.5 had problems, which I can't believe. There are at least two sites that keep track of reported problems, with lists of the weeks with the problems and hardware configurations. There is also a less comprehensive poll here.
This goes back to November at least. When I called last month, each of the reps I talked to at Apple admitted that the problem existed.
I was instructed to send my pictures to Apple engineering. There are far too many 21.5s with this issue for the problem to be ignored.