No it is not compatible with their other lighting, near as I can figure out. I thought about maybe drilling an taping the bracket to take a TP-01 dovetail, then a Flex arm and you'd have a YS mount for other lighting, like the excellent Fix LED1000DX lights, for 1000lumins each.
Their new two light tray supports both the Pro-V8's and their 50/100w halogen lighting system (according to their literature). Personally, I'd probaly rather have the dual noctural lights (about as bright as the Pro-V8 each) that but powered by AAA and weigh about 1.5 lbs less each. There are other, and better lights, but for my needs, those would suffice.