Yup, and such be a lot of people figuring. Conflicting info from some Sony releases (as would be expected), but it's all in the realm of speculation anyway. Plus, in my mind the difference between December 2005 and "early 2006" is very small, though people seem to put a lot of importance in it. Frankly, if anyone was launching in early 2006 I'd expect them to push a bit to get some kind of release SOMEWHERE by holiday 2005--it grabs holiday attention, fuels demand for a broad release, and can really play havok with opponents' sales over that period. (Of course also your own holiday sales of the previous gen in that period, which would be the only reason I can see to avoid it. Timings and scale can always be debated the closer one gets, if all one is dealing with is a month or two.) And these particular comments may just be referring to the expected UK release... (No, I don't think they're going to do a global, simultaneous launch. Faster transitions, yes.)
Meanwhile, I find the other tracking info to be a lot more interesting overall. ^_^ The rest is debated enough already.