I expect that somewhere, yes, someone does know exactly what chipset it has.
If anyone is beta testing it, they wouldn't be allowed to tell you.
There's not really a lot of information to go on, I could infer it'll be Broadcom on the basis of the specifications saying up to profile 17a.
But then I checked in the TP-Link VR600 GPL source code, there's a VR400V1_config file that indicates it'll be the usual 63268 or 63168 chip.
