I found this on another site, courtesy of a random poster. Apparently, as is the case so often, someone managed to complete a functional 3.72 CFW before the Demonhades crew... (/sarcasm)
Some weird site called ps3- cfw.
What intrigues me is the video they posted. Admittedly, I tend to be very skeptical of this kind of thing (seen fakes way too many times), but the videos usually have easy-to-spot characteristics as to how the exploits seem "possible", typically by doing good old video edition. My bet is that they picked another PS3 (one with up-to-date 3.7+ CFW) and ran a legit copy of Black Ops; it'd be easy to edit that in from the loading screen onward.
A friend of mine said he might be testing this out, and if it turns to be legit, I'll let you guys know.
Or if anyone is feeling reckless enough they can tell me.