Speculation, just for the fun of it: If there is a KAF-3, it's not the J. Else they'd have named it such.
Rather, the J is a KAF-2 as Junk (cheap) version. Missing features for profitability purposes. KAF3 will be fully KAF-2 compatible and will add features within the lens. Piezo-motor controlled aperture. Image Stabilization on longer lenses. A larger image circle for film and future larger digital sensors. Pentax will do what they've done for a long time: We're going to see many current lenses closed out. They've been on the market for too long. They'll be replaced with J & KAF-3 versions, built more economically, and also to be sold for another 20 years! Collin (just thinking too much) Brendemuehl
