samba - May 2012 - Setting up DNS on a joined samba4 DC to W2003 Domain

Hi,

I've installed s4 succesfully on two servers to replace the w2003 domain
controllers, but to do that, I need to get DNS to work and I can't find
documentation on how to set up bind to "import" DNS from AD as the how
to is to set up and provision a domain or the docs on joining as DC are outdated
and have bearly no info on doing this.
Can anyone help me on this?
Regards,

Juan Pablo