G&P has finally posted some pics and info (not much but some) on their site.
Originally Posted by G&P
-For Marui M14 Series
-Maximum can fit 9.6v 3000mAh Battery
They say it's going to cost around $700. Can fit a 9.6v 3000mAh battery.
I kind of like the look of the KA one. Looks a bit lounger but takes only a 9.6v 1100mAh battery. I have also read that the G&P one can change stocks like the real EBR.