Just updated mine today.
I was one of the suckers that bought the super expensive ones in the past, though I think the last time I did that was 2017. So some of the features in this update are not new for me, but a few of them are.
First, when checking the version, I notice there's now a Reset button. I didn't press it, but I imagine it factory resets the AVN.
In settings you can now disable showing the current track along the top of the screen when the track is changed. You can also configure which media sources the "MODE" button on the steering wheel cycles through. Nifty.
I also noticed that my audio now reduces volume when I put the car in reverse, which is nice.
When starting the car up, my audio source can now default to Bluetooth instead of falling back to Radio. This has been nice as well.
There were a few nav settings that I didn't notice before, which may or may not have been available - including "speed alert" (turned this on, don't really know what it does), and "merge alert" which appears to show an icon on highways where a lane will be merging into the roadway. Didn't snap photos of these since I was driving.
Overall pretty happy with this update given the cost.