SPDIF out on UDOO

hi michelangelo,
I love the clear, full sound of Volumio on UDOO via USB to DAC. But my DAC only plays 48khz via USB.
As announced I was hoping to connect via SPDIF coaxial to get the full resolution. I didn’t find it so I guess SPDIF is not iplemented yet.
I would appreciate to get clear information about this feature.
Great work!