Update: Just received that - Nikon product names start with the quarter in which they are/will be released (Q1-Q4) followed by a sequence number counting all Nikon DSLR starting from the D1. For the D3s I came up with Q242. Nikon have confirmed in an email to a reader that this was the code name for the D3s.
NPS members in the UK have received the following email:
"....We'll email you more details about booking your place, and NPS member preferential allocation of the new FX format Q660 soon..."
Is Q660 the code name for the new Nikon D3s?