Actually, I don't believe the support was ever announced for the IQ100 until yesterday. I may have that wrong, but I never saw it in the release notes. Yes, you could attempt to open the 14bit files but I did not find the conversion that good and many times the files still did not open correctly.
As one of the biggest selling points from P1 I see over and over is the "true" 16 bit files, not having that ability to open and work them, is not really "support" IMO.
Good news is that with help from many folks on this forum, Adobe was able to get the data they couldn't seem to get from P1 and the support is there now. I will add, the files look very good also. Nice now to be able to do a true exposure bracket and even better a pano from raw, as that makes a huge difference.
Notes, the lens profiles are very limited, and appear to only cover the older Mamiya stuff, non Schneider BL and Non BL. If you are working a pano with a lot of sky no clouds or any other pure background, you need to load something for the lens profile before you run the pano tool. The pano tool uses the lens profile to help blend the images and remove edge vignetting. I just loaded the stock 35mm F3.5 and it works OK. Would be better to see the Schneider's added at a later date.