MattR:
Looks like I was migrated last night. PPPoE hasn't dropped, but I see the new BNG on a PPPoE scan in my Mikrotik.
Another user migrated here last night too.
Thanks to this thread, and other posts here, I was aware it was coming. My PPPoE on my Mikrotik router dropped and could not reconnect at all. Reconfigured for DHCP. Thankfully it seems my fixed IPv4 and IPv6 prefix remain.
I did receive and email this morning about "changes behind the scenes" and information on a new account number. Nothing about changes to connectivity though.