The GH3 is now in Stock at BHphoto (Click here) too!
The GH3 is already in Stock for days now at Adorama (Click here) and Samys (Click here).. Adorama also offers some GH3 + accessory kits (Click here). It is surprisingly still not in Stock at Amazon but at least you can play with their new Lens Finder Tool at Amazon (Click here) to kill the time until it will be back in Stock :)