We’re delaying this transition one more time, to January 11, 2021. As we got closer to the switchover date, we realized we need to do more outreach to our subscribers first, to make sure no one is taken by surprise. To everyone who has already gotten ready for the switch, thank you!
We will still be making a smaller change to our issuing intermediate this fall. We’ll switch to using our just-issued R3 intermediate. However, that intermediate will be cross-signed by IdenTrust (just like our “Let’s Encrypt Authority X3” intermediate is), so compatibility with your site visitors will not change. Your ACME client should automatically download and configure the correct certificate chain with the next issuance after we make the change.