Since there were no significant leaks up till now, I would say that the Nikon D800 will not be announced this week. Pretty much all the information I have been receiving in the past few days says the same thing - the D800 announcement is postponed (including digicame-inf0 who first mentioned the October 26th announcement date). If something changes in the next two days, you will be the first to know.
I just want to remind you that I never received any reliable information (see also this post) for the October 26th release, except maybe the rumored product presentation in Marrakech. If you have read my previous comments here on [NR], my estimation was always "announcement in 30-60 days". We will never know if there was really a Nikon D800 event scheduled for the 26th and then postponed because of the flood in Thailand.
I still believe that the Nikon D800 and the specs described before are real. I do not have any other updates for now.