For some time now, the progress towards the Copy Editor Badge is being displayed at http://stackoverflow.com/review/
I guess a screenshot tells the whole story:
Red emphasis mine. The text proclaims a target of 400 edits, while the mouseover claims 500. Which will it be?
I can only report on SO as I don't have enough edits on other sites to see the Copy Editor countdown, but other sites are probably affected, too.