http://egami.blog.so-net.ne.jp/2012-10-05
(in Japanese, Excite English Translation Here.)
Via Photo Rumors.
This new patent has just been published yesterday. Do note that it is specified that the "Image Height Y = 21.64mm", which simply tells that it is not a 135 Full Frame lens for the image circle, despite that the focal range is really common for many of those Full Frame F2.8 tele-zoom lenses made by others. The slightly larger image circle than APS-C will allow the in-body SR to work and also that the sweet spot of the optic could be utilised.
Btw, it is yet another piece of evidence to hint that a Pentax Full Frame body and system is not going to happen in the foreseeable near future, as Pentax Ricoh is still putting much effort and resource in the development of those hopeless APS-C stuff! >:-(
Updated: Thanks to the reminder by someone and I have checked again the performance chart diagrams as published (example here), I think it is actually a Full Frame lens! The Y is simply the distance that is measured from the optical centre! So, it is just a Full Frame lens! Well, the dark cloud has suddenly disappeared and been turned to bright light then! ;-D Sorry for the confusion anyway and I am really glad that I have been wrong! Still, the new lens and design is yet 10cm longer than the old FA*80-200/2.8, which *also* has an internal zooming mechanism and is much shorter and "compact" enough.
Besides, this new lens should include an in-lens IS (or SR in Pentax' terminology), as the image circle just fits and there is no spare space for the body SR anymore.