A year ago today, Nikon announced the 300mm f/2.8 VRII lens. In the past, there was never a new product announcement past this date (in 2008, the Nikon D3x was introduced on November 30th, 2008). I think Nikon is done for this year - it is too late now to bring out anything new right before the holidays. CES 2011 (January 6-9th, 2011) is the next potential date to unveil a consumer product (maybe the Nikon mirrorless camera) - Nikon has only reserved meeting rooms at the show and will not have a real booth. The Coolpix line of cameras are usually refreshed in February.
Here are all Nikon products announced in 2010: