New "Generation Y" Hierarchy of Root and Intermediate Certificates

In a ceremony held in September, Let’s Encrypt generated two new Root Certification Authorities (CAs) and six new Intermediate CAs, which we’re collectively calling the “Generation Y” hierarchy. Now we’re moving to begin issuing certificates from this new hierarchy, and to submit it to various root programs for inclusion in their trust stores. The two new roots look very similar to our existing roots.