This is probably due to the Hackathon from July 8-13 and that at least some developers are probably still traveling. Snapshots are often not built for public use during that time from my observation but it is unusual for cvs changes to not be fanning out to the mirrors. Perhaps some maintenantce issue or something else is going on. It is not specific to one mirror as far as I can tell from two other Canadian and US mirrors using cvsync or rsync for cvs.
Bryan