We have not yet received cross-signs from IdenTrust on the new R3 and R4 intermediates; we won’t be putting them into service until after that happens. Similarly, there are a few pieces of due diligence (e.g. issuing valid, expired, and revoked example certificates to comply with BRs 2.2) we have to do before we’re ready to start issuing with the new ECDSA hierarchy.
I don’t think we have a strict timelime for when we expect that work to be done, other than “as soon as practical”.