Previously I mentioned I was working on an update to RFC 2716 that process is now complete, the RFC number for this new work is 5216.
This update was really about adding clarifying text address common implementation issues, better aligning the specification with its dependent RFCs (like RFC 4346, RFC 3280, etc), updating to specification to represent actual implementation practices to aid in interoperability and of course improving security guidance for implementers.
To be clear, no new capabilities were added to this RFC; despite that the document increased 35.9934% in size (from 50.2 KB to 71.7 KB); larger doesn't always mean better but in this case I think it does.