The initial report was that Nikon prices are going up this Spring. Now it seems that this may happen earlier, way earlier... like in 5 days, on January 12, 2009 (Monday). The source is an email sent from a major shop in the UK. There is also similar thread on flickr.
If you are planning on buying any new equipment in the UK, I suggest you do it this weekend.
Here is the history of this rumor- it has been going on for a while.
Update: report from a reader: "D700 at www.robertwhite.co.uk just jumped up from 1331 to 1505 pounds (excluding VAT)."