A nice in-depth review from Ryan Somerfield:
Noise performance seems pretty well improved (up to Pocket 6k standards). Unfortunately, no information on rolling shutter performance in this video though. Also, as suspected, it seems that using the focus/zoom demands prevents you from streaming or recording to USB-C media (as the USB-C port can only handle one function at a time it seems).
Looking forward to seeing more footage from the Broadcast G2.