This is not going to happen any time soon, unless of course Congress passes a law to require it, which they won't.
The privacy advocates won't agree to video recording, and the expense of adding the hardware to the EDR module will be a strong deterrent to automakers, who will also lobby hard against it. The trial lawyers will also try to kill it, because a video recorder would be typically be a witness against their plaintiff customers.
To encode video into a reasonably compact form, a standalone video processor chip would be required, such as are packaged into DVRs. A ballpark price for one of these is probably in the $20 range. In addition, enough flash memory would have to be added to store the video streams in addition to the vehicle data. 90s of video at reasonable resolution and quality would require several megabytes of flash, easily several more dollars per vehicle.
I also question the utility of recording GPS data. A vehicle typically has a fairly accurate on board velocity estimate, which comes from the ABS wheel speed sensors. Unless a driver is involved in a hit-and-run, it will be pretty obvious to accident investigators what the path of the vehicle was, based on external evidence and the on-board inertial signals which would normally be recorded in an EDR.