The just announced Firmware for the Panasonic GH5 offers the promised improvements when the camera was launched like 400Mbps All-I compression for 4k 10 bit recording and or 200MBPS 1080p. Also promised was near 6k Anamorphic shooting and HDR Ready Log Recording Gamma. All of that is in the firmware but the surprise comes from all the extra improvements that made the way into the 2.0 firmware release.
The new unexpected features range from a full tethering option for Mac or PC with free downloadable software to improved autofocus recording which was one of the weakest features of the camera. As far as slow motion related improvements it seems the firmware is not making any headway there. The bitrate improvements do not mention the VFR mode.