See what Photo Rumors reports:-
http://photorumors.com/2013/01/28/full-list-of-new-cameralenses-to-be-announced-at-the-cp-show-this-week/
Update (1-31): The new WG-IIIs and WG-10 have been officially announced:-
http://www.pentax.jp/japan/news/2013/20130130_1.html
http://www.pentax.jp/japan/news/2013/20130130_2.html
(Both in Japanese)
There are four colours in total for the WG-IIIs, two for the WG-III and two for the WG-III GPS:-
As for the WG-10, there are also two other different colours:-