Although I'm an AGL fanboy (I have his rookie card) I have to agree with Matthew here. Pushing the transition this fast, just when the world is on the verge of accepting HTTPS as the default, is reckless and will overall reduce the safety of the Internet.
FYI, we are deploying in the same manner as Cloudflare, with RSA/SHA1 and ECDSA/SHA256 side-by-side. We are committing our changes to the public ATS repository and hopefully those changes are useful to other projects. Unfortunately this is dependent on OpenSSL 1.0.2, so we might have to deploy beta code into production if the OpenSSL project can't beat Chrome's arbitrary deadline.
FYI, we are deploying in the same manner as Cloudflare, with RSA/SHA1 and ECDSA/SHA256 side-by-side. We are committing our changes to the public ATS repository and hopefully those changes are useful to other projects. Unfortunately this is dependent on OpenSSL 1.0.2, so we might have to deploy beta code into production if the OpenSSL project can't beat Chrome's arbitrary deadline.