GH3 will have GPS?
You certainly will be able to disable it. Thinking that it might still give the police something they would bother to deal with, is plain paranoid.
I would welcome, if the GH3 has GPS, but only if not too much at the expense of operation life with the batteries. Most people, though, believe that the image on 43rumors is fake (could be a leak on purpose as well).
...is watching you.
I'm really hating this GPS kick, especially in cell phones where police are known to take your phone to see where you've been.