October 2022 slides from Microsoft say that ISO/IEC JTC1/SC27/WG2 has solicited "comments on proposed inclusion of FrodoKEM, Classic McEliece, and CRYSTALS-Kyber" in ISO/IEC standards.

iso-mceliece-20230419.pdf is a document prepared by the Classic McEliece team as a draft of a potential ISO McEliece standard. This draft is being released to the public for comments. As per ISO's rule that "Whenever possible, requirements shall be expressed in terms of performance rather than design or descriptive characteristics", this document specifies the mathematical functions being computed, without constraining how the functions are computed.