As of IETF-97:
ACME met Wednesday. Since the last IETF we resolved almost all issues on our main document, and at the meeting we agreed on proposed resolution for all others. When the new draft is issued, we’ll enter WGLC and promote this as an “implementor’s draft,” like HTTP-bis did. We’ll consider it frozen until next IETF, and either re-enter last call or forward up for IESG review at the next IETF.
We had also adopted a CAA draft, had an initial presentation from Yaron on short-lived certs, and a heads-up on STIR interest on using ACME to get certs for phones. So between now and the next IETF we’ll also have discussion about re-chartering to add these new work items.