The CAF worked in 0.83, the 0.82 beta, and 0.81. I believe the "live view" CAF did not work until the 0.82 beta, which is also when they added the Human Track mode. I've posted this elsewhere - we're currently at about GH5 v2.0 firmware quality on the AF. There is still a long way to go, but there are some real scenarios in which it is usable. The Olympus 12-100 f4 especially is solid, partially because DoF of f4 is pretty forgiving.
Other bugs I have seen - the beta had a weird issue with AEL. It would seem to get locked frequently when I didn't press the AEL button. Sometimes settings wouldn't take effect immediately, and a restart was required.
I have the Portkeys monitor with LANC control that is now able to Start/Stop, adjust Focus, set Focus point, Zoom, set ISO, Shutter Speed, and Apeture as of 0.84 firmware.
I don't disagree with calling this a "beta" product. I also don't think this company would be able to get to 1.0 nearly as fast if they were trying to do it without community feedback. It's a brave tactic that has (a) gotten some money in their pockets to pay for more development, and (b) started to garner them a following that I don't think any other camera company has.