Quote: Tamron's goal now is to move their entire lens line over to Image Stabilized lenses so this is likely why Pentax and Sony will get left out since they have anti shake bodies.
That's a strange thing to say actually. If the lens has IS in it, it can be used on a camera with body IS perfectly well. Just don't turn on BOTH IS systems, and you'll be fine. This can be tested on Olympus E-510 camera with Leica lenses that have Mega OIS system in them. Here is the article about this -
Olympus E-510 with Leica D 14-50mm - Double stabilisation or double trouble
As for 1.25x... Right now Pentax has two cameras - K100 and K10. While old players, Nikon and Canon, have 3+ models in different niches, like Canon D400, D40, D5, 1D mk III. Pentax COULD introduce 1.25x crop camera, but that will be extremely unwise to make K20D 1.25x, because not all DA, Tamron DI II and other lenses that work with K10D will work with K20D. So instead of making not-fully-comaptible with it's predecessor K20D they probably will intorduce something like K2D, with new 1.25 crop and set a higher price to it.
As for me personally, I'd be very disappointed to recieve 1.25 instead of 1.5, because that will shorten the EFR of lenses, and I like tele-shooting...