This deal is almost unbelievable. Yes, the GH3 is also marked down to $928 - but for less than $500 for the G6 is an absolute steal.
This camera is the best value for money hybrid still/video camera in its class. It has focus peaking, wi-fi with Near Field Communication (NFC) for wireless control and file transfer and a built-in intervalometer. All features that are missing from the GH3.
At these prices, they won't last long. If you want the best large sensor interchangeable lens video/still camera below $750, you may want to pull the trigger on this deal.
(Note: I just looked at the product listing and after only a few hours, the G6 is now backordered at $498. You can still order it at the sale price, however, and Amazon won't charge your card until the camera ships)
(Note 2: I just checked eBay, and you can still get the G6 for $498 from Adorama via eBay - which is less than you can get them for from Adorama direct)