Adobe has been flooded with similar questions on the Adobe Photoshop forums. The answers from Thomas Knoll and the other Photoshop gurus are that ACR is updated 3 or 4 times per year to add new cameras, so people should just be patient. The process of adding support for the D2X is complicated by the need to reverse engineer the structure of the NEF file, which Nikon treats as proprietary. I expect an update will be available for download in due course.