OK, I broke one of my cardinal rules and joined the early adoption crew.
A bug and a couple of oberservations, and then some good.
Each time I moved the mic, I got a "critical error with mic or speaker connection". I just had to go back to the previous step, re-recognize the mic, then resume. It would then work.
All the levels are hot by 3-4 dB. Perhaps we should assign an offset prior? Not sure. Perhaps this will be part of an update or explanation soon. Certainly doesn't matter in the end, but I had to turn down the volume a bit from my typical level.
Then, when trying to download the settings into the AVM60, it wouldn't recognize my device until I unplugged the mic from my computer. Didn't used to have to do that.
Now, for the good. Yes, it is better than than ARC-2.
The first thing I noticed was more detail, separation, and level that has been added to the surrounds and atmos heights. They're more active now, and there are some subtle effects that are more audible because they are set a little bolder. They don't seem more localized, but they definitely have more prominence in the mix.
Second, and this requires more critical listening, the dialog seems more connected and clear to the overall calibration. Same basic clarity, but seemingly a more accurate volume level and tone to go with the other speakers. Slightly less bright in my setup. This will take more review with familiar sources, but I'm curious if anyone else has that observation.
Needs some updates to fix a few quirks, but the goods are there.
Video: JVC RS620/X9500 projector, Stewart ST130 screen, Panasonic ub820 UHD player
Audio: Anthem AVM60 preamp, Anthem MCA525 amp, B&K Reference 125.7 amp
Subs: dual SVS PC-12 cylinders
Speakers: Jamo 626k4 in-wall mains, Jamo 631k4 bi/dipole surrounds, DefTech DI6.5R heights