Panasonic is now offering an extended 2-years warranty on select Panasonic Lumix G-series cameras and lenses, purchased between 11/23/2014 and 12/27/2014. The GH4 and even the new GM5 cameras are included in this promotion. The warranty extension form can be downloaded here. All other instant savings are still valid, including an extra $50 gift card when you purchase a GH4 at B&H.
More deals on photography gear can be found here.