This is a rather an unusual development: Nikon will announce two new mirrorless cameras during the 2013 CES show that will take place in Las Vegas between January 8-11.
Nikon 1 J3
The Nikon 1 J3 will have a 14MP sensor with slightly improved specs. Don't expect anything major in terms of new functionality or design. FYI: the J2 was announced just 4 months ago (August 9, 2012).
Nikon 1 S1
I am still not sure, but it seems that this will be the new entry level Nikon mirrorless camera and it will have a 10MP sensor. Very cheap and very basic. The S1 should be placed bellow the J product line. The new Nikon 1 camera lines will be S - J - V.
I also expect that Nikon will announce the D5200 for the US market at the CES show.
Expect more interesting products to be introduced during the CP+ show in Japan (January 31 - February 3, 2012).