CR has received an email stating January 2010 is the date:
“Yes, it has been delayed until January now, this is the second time this has happened although this time not due to a technical issues but more marketing. If everything goes to plan (which hardly happens to be honest), January will be a killer month for announcements:
1Ds Mark IV together with the new duo of high end lenses. The 70-200 2.8 IS II and of course the 24-70 II IS.”
They rate it as CR1 - their lowest rating - click the source link below for their response. Source: CR on 11/17/2009. | 
, B&H Photo Video, OneCall, Adorama 
