Unfortunately this is not planned within the next 12 months. If this is needed for your scenarios keep voting on this item and we will review at a later date.
We continue evaluating several alternatives to provide full email customization. We are actively working on an alternative.
Unfortunately we do no yet have an ETA.
We are working to support SP-initiated SSO as well. However, we don’t have timing on when it would available to customers.Sai Koya commented
Azure AD B2C as SAML IDP is very much needed because most of the existing solutions currently doesn't yet support OpenID, and they still expecting SAML IDP for SSO.