DoD is expected the publish the proposed rule and guidance documents in the Federal Register on December 26, 2023 with the final due dates for public comments included.
The advanced documents are available here:
CMMC 2.0 Proposed Rule: https://public-inspection.federalregister.gov/2023-27280.pdf (234 pages)
Availability of CMMC 2.0 Guidance Documents: https://public-inspection.federalregister.gov/2023-27281.pdf (6 pages)