r_emailaddress already exists in v1.
It is added to the list of scopes when you check “Connections > Social > LinkedIn > Settings > Attributes > Email address” in your Auth0 tenant.
I second your concern though. If v1 really dies in 2 weeks, and there is anything for us to do to upgrade to v2, now would be the right time to communicate about the changes.
Even if they are not ready to be implemented, but at least to know what to expect, thank you.