I could swear Anton mentioned something a while back about how the title update or whatever first patch/dlc is handled free by MS, but after that they have to pay and go through testing. Something like that. That's why they should wait and get all the bugs listed that they can and try to knock them out at once. After that it becomes a money issue.
Pretty sure he mentioned that somewhere around here a few months ago.
...or I could have dreamed it all.