I have checked the service manual for both MK2 as MK3, but there is no information in there that has the answer to your question. The CDJ-1000MK3 has a 24-bit heart but I doubt that the output is 24-bits.
The digital output of the CDJ-1000MK3 complies with the S/PDIF standards so it will probably be 44.1kHz.
The bit depth that is mostly accepted for S/PDIF is 20-bits, 24-bit is possible but not much equipments supports this so I doubt that the CDJ will send that out.
But why do you want to know ? All equipments/sound cards I've came across throughout the years accepted the signal and recorded fine and I never had any issues regarding the specs of the signal or it's acceptance.