From Let's Encrypt:
"Looking Forward to 2018"
"We’ve got some exciting features planned for 2018.
First, we’re planning to introduce an ACME v2 protocol API endpoint and support for wildcard certificates along with it. Wildcard certificates will be free and available globally just like our other certificates. We are planning to have a public test API endpoint up by January 4, and we’ve set a date for the full launch: Tuesday, February 27."
https://letsencrypt.org//2017/12/07/looking-forward-to-2018.html