The GH4 looks like a very exciting addition to anyone's kit. And the YAGH had the potential for being a perfect interface for balanced audio w/ phantom power, and HD SDI BNC out, until I found out that the only way to power the YAGH was via a 12v power supply. So, to use that combined system in a portable setup means some kind of rig & 12v batteries & adapters. So much for small & light weight.
Perhaps we'll see some elegant solutions presented at NAB?