From a consumer's tax-point-of view, if it's going to be Jan then why not Dec? Then you would get an extra year to write off the purchase from your taxes if you are a professional.
Quote Adobe -
"Lightroom will ship when its Ready - not before"
If ready means December 06 - great! If Ready means Feb 07 thats still great! Personally I want a product that ships complete and doesnt require immediate patching.