Yanno what? I"ve now spent a couple of hours actually probing into this a little further, and I don't think it actually is official. All the sources point back to this page, a blog by an American named Tony Delgrosso. He seems to have some expertise with colours, so I think he's just reporting his findings. I can't at all find anything approaching an official BBC announcement. *Sigh*. Looks like I'm just gonna have to make up another palate, cause this "official" blue is lookin' pretty green so far.
Argh. This probably means even more of a delay in getting the colours recalibrated on the site.