http://www.dpreview.com/articles/6059494336/review-in-progress-pentax-k-5-ii-and-k-5-ii-s
I wonder if they would complete the review(s) before that the camera(s) are discontinued! :-o
Meanwhile, it is found that the K-5II has a rather weak AA filter, whilst the K-5IIs has none, e.g.:-
(Above: Left: Image from the K-5II; Right: from K-5IIs.)