User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-92.5.252.208-20120902165819/@comment-122.59.74.108-20120903124604

The monthly fee is first of all not monthly usually depends on how lon gyou choose with the maximum being a year but it helps pay for improvement to that service aswells as the monthly fee only being neccesary for online play whereas the battery as far as i know saves power