So is the original replace really deprecated? If so how long till these are released? Otherwise, can you remove the deprecated flag? We don't want to build with something flagged as deprecated for the client.
That's part of the mistake. A handful of changes relating to transfer endpoints were rolled out when they shouldn't have been; all changes and deprecations to the transfer endpoints are in the process of being reverted. Any future changes will be announced as normal.
You can request access to ongoing betas by opening a case with Care. I don't know if they're accepting customers at this point, but that's how you ask.