Here is a link to an update post in the P+S thread regarding the IMS-Nikon mount. It is not endorsed by P+S Technik and I am not optical engineer, so the post should be judged accordingly.

http://www.dvinfo.net/forum/p-s-technik-digital-image-converters/480786-p-s-ims-nikon-professional-mount.html#post1549836