Octupi wrote:Am I missing something?
No.
There simply are two profiles for your camera called "ACR 4.2" because it was introduced with Camera Raw 4.2 and then an updated one called "ACR 4.4" which originally came with Camera Raw 4.4. Generally it is recommended to use always the latest camera profile---which in your case currently is "ACR 4.4"---but the earlier profiles are kept available for backwards compatibility. The two profiles are very, very similar anyway; you'll be hard-pressed to see any difference between them (albeit there
are differences).
Don't confuse the profiles with Camera Raw itself just because the profiles are named after the Camera Raw versions which originally introduced them.
As David just explained, at Adobe Labs (i. e. not the regular Adobe download section) you can download the beta version of the new Adobe DNG Profile Editor 1.0 which allows to create your own camera profiles from scratch or to tweak exisiting profiles. It also replaces the old ACR Calibrator scripts. Google will find it. Along with it come a few new camera profiles ... but in my opinion these are not very good (way too red generally).
-- Olaf