Official comment
@Tony > Sorry, but as others have noted, no previous Pioneer DJ product was released with HID support for a competitor's software product out-of-the-box. It was only after some time that each product was supported by other software. With the CDJ-2000NXS2, it was never advertised or marketed that there was, or would be, integration with competitor's software, although since release we have said that we're in negotiation with those manufacturers to provide integration in future.
Regarding rekordbox, the reason the RZ has a license for rekordbox and the CDJ does not is that the CDJ is intended as a stand-alone product whereas the RZ is a controller for software. Without the software, it's effectively just a mixer. rekordbox is still FREE to use with a CDJ and you can use the ethernet link to communicate with the players, providing nearly the same functionality through that connection as if you were using rekordbox in performance mode, since the CDJs are still our top-level product.