Update: Nikon Germany also announced the system maintenance window.
Nikon UK announced a system maintenance for the period of December 8th to December 10th, 2009:
This maintenance time window coincidentally matches the scheduled Nikon Event in Slovenia on December 10th (maybe they are updating their website with new products which has been a common practice in the past, before an official announcement). I don't have high expectations for the December 10th event at that point - it just has been too quiet lately but nevertheless this is the rumor I have for you today. I also do not have any information for similar events in other countries.
Probability of new Nikon products being announced next week: 60%. We are talking about lenses here, no more DSLRs this year.