The PH-RBC77 (FA* 28-70 + 80-200) is discontinued.

A (maybe modified/shortened) PH-RBK77 (DA* 200 + 300) could be an alternative, as it seems to share the same mount. See e.g.

http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/111533-fa*28-70mm-hood-dilemma-solution.html

Pentax (Q) FF event: http://www.schaft.net/n00bs/2011/07/21003307.html

Ordered by sensor size: http://farm7.static.flickr.com/6140/5942711062_02af43d91a_b.jpg

Obviously, Pentax realized that there exists a gap between the K5 and the 645D and decided to place the K-1 (alias MR-52 alias MZ-D) there, which is an interesting and promising decision imho.

MZ-D: http://www.dpreview.com/news/0110/01102401pentaxdslrnomore.asp
K-1: http://dc.watch.impress.co.jp/cda/other/2006/02/17/3233.html
Ricoh/Pentax: http://www.techradar.com/news/photography-video-capture/cameras/pentax-uk-speaks...