I cannot provide an authoritative answer but it appears that CO has started discounting the fare-up at the OLCI time. Some discussion about it here:
http://www.flyertalk.com/forum/conti...velopment.html.

As I noted in that thread, the fact that they are labeling it "on sale" and changing the rules of what "buying F" really means appears at first blush to be an unfortunate policy change that undermines pretty much all the previous "we're selling them at F prices; elites won't be affected" claims they have made.