Ivan's theory sounds about right. Certain publishers will not work with MG unless they have a pretty good DRM system (in this case, the change) And the region locking theory makes sense. There was that whole issue that was brought up with Ef the first tale and MG still having to censor HCGs, even for a localized release.
That "battery" feature is probably the dumbest thing I've ever seen though. If you go offline with the game, the battery drains and you have to recharge it by going back online. Hopefully that is never implemented, because that would only hurt the paying customers that