User blog comment:Sgt. S.S./Why PS3 users need to calm down over the DLCs/@comment-217.120.244.15-20130116210330/@comment-3428817-20130117220616

It probably would not be a good idea for Bethesda to give a solid release date. If a problem cropped up, then they'd have to delay the DLC's release, which voids the original release date.