I've got a source for that rumor, but it concerns Leica, not Pentax.
First, it will be a CMOS sensor !
And the european semi-conductor company is ST micro.
I've send a post about that on "Chasseur d'images" forum one week ago.
The source comes from a article by "les numériques" about french tech companies :
STMicroelectronics : le géant invisible
Here is the interesting stuff :
L'aventure photo se poursuivra sans doute sur la Photokina : "un constructeur allemand de renom", Leica, devrait y annoncer un nouveau reflex – moyen format ? – équipé d'un capteur géant, CMOS, signé ST. À suivre......"
Auto-translate :
The adventure picture is likely to continue on Photokina: "a renowned German manufacturer", Leica, is expected to announce a new SLR camera - medium format? - With a giant sensor, CMOS, signed ST. To be continued ...... "
So, for the next photokina, Leica should announce a Mf with a CMOS sensor made by ST micro, but nothing concrete about Pentax, it's just by extrapolation.
Regards,
Arno