12 Bit DNxHR

This was mentioned in the AE forum but was never answered. On the Avid site DNxHR HQX and 444 are both listed as 12 bit yet in both AME and After Effects as mov or MXF they are 10 bit. Is this an error and they are actually 12 bit or have Adobe somehow managed to engineer their own 10bit version of DNxHR? If so when can we expect a 12 bit version? On the Windows side of things we are severely lacking in 12 bit codecs for sending VFX shots for colour grading.

Link to Avid DNxHR spec DNxHR Codec Bandwidth Specifications