The new lens list at Pentax/Ricoh is more than interesting
http://us.ricoh-imaging.com/products/lenses/645-lenses/. Obviously, the new 28-45, 35, 55, and 90 are there to stay. Also the 45-85, 55-110, 80-160, and 150-300 zooms. Then there are the 75, 120 macro, the 300 ED. Gone are the 45, 150, 200, and the 400. Hard to tell whether this is an incomplete web design job or something of significance.
If this present list is of any significance there could be a new portrait lens (150/200 replacement) in the future. Don't know what they'll do with the 45 and the 200. Glad they kept the 120 and 300 for right now, these are still great lenses. A new 400/500/600 would be nice, especially since the 400 was a well corrected lens and very portable, and the 600MF was also excellent. I guess they'll replace the zooms as planned then. Surprised the 75 remains for right now, likely due to its compactness and long-time popularity, even though its an odd focal length for the 33x44 sensor. They should use the 67 AL design for a replacement as it is also fairly compact.
For me this new line-up indicates a potential change in their lens line-up that is somewhat necessary. Perhaps not for the 645D owner, but with the 645Z, several of the older lenses are starting to show their age, definitely the 45 and also the 150 at wider apertures, and it would be nice if they found a successor just like the 35. I care less about the zooms, especially for medium format, but that is just my personal opinion. Especially the 55-110. The 150-300 is also not that great, but not bad and very versatile.
I remain hopeful for a wide prime, but that remains to be seen. Pentax has a long history of CP+ introductions, as their Japanese market appears to be the major target audience. Perhaps we'll hear more then.