The Panasonic GH4 will soon iterate to version 2.1 of its firmware, with embedded time code and control signals enabled on the HDMI output. You can also change the HDMI stream to 60P/50P while recording in-camera at 30P/25P. It may also include a new V-LOG picture profile that’s being tested. As part of the updates, the DMW-YAGH Interface Unit will also need an update to version 1.1.
The Panasonic updates have been announced, but won’t be available to download until early December.
The Olympus E-M1 gets a firmware update to version 2.2 today, which helps deal with the bright spot problems some users reported. Note that updating to this version will reset everything in the camera other than the AF focus adjustments.