Even though the internal DNS and the BIND DLZ modules are new, they both support all basic requirements for Active Directory and more.
If no PTRs exist, there will be no details listed and attempts to update will result in an error.
If you're running Samba as Active Directory Domain Controller, you also have to administer a DNS server.
You will already find general information on the internal DNS and the BIND DLZ module and documentation about Bind as DNS Backend in the Wiki.
The internal DNS backend currently needs a restart of Samba to take effect.
DNS has been working for two years without a issue.