According to:

http://www.wow.com/2009/10/29/patch-...s-as-you-want/

the lock-out will work differently. It does, however, sounds like you can't do random dungeons with a pre-invited group, which sounds odd to me, and contradicts what I think I've read (have no links though). Can anyone confirm with a blue post or similar, that random dungeons can be done with a pre-invited group?