[majewsky]

I don't know much about ACME 2.0 (except that it is apparently necessary for LE to be able to start offering wildcard certs). Can you expand on why CAs are waiting for 2.0?

[mholt]

Probably because it's the first IETF-approved spec for the protocol; right now it's all in draft status. LE itself will be adding ACMEv2 next year.