I wouldn't worry too much about the rejuve issue. I imagine it will never be referenced again, and other artists will continue to depict Dredd as an ageing, scarred monstrosity.
As Mike pointed out when he pitched the story, Chief Judge Goodman is shown leaving a rejuvenation clinic 'after his monthly treatment' in the first panel of the first page of The Day the Law Died. So there is certainly historical precedent for Judges of a certain age receiving this kind of rejuve.
Understandable, but I'm with TB on this one. IMHO, and as a Grumpy Old Fecker myself, it was the aging process and Dredd's reaction to it that gave the last decade of Dredd it's most interesting aspects, I feel kinda cheated by this 'rejuve' a bit like the DC/Marvel 'oh he's dead, oh he's alive again' slock.
I've always found the Car-Roll droid to be one of our best writers and I'm sure that will continue, however a spritely Stoney-Face is the last thing I want to see.