So far, after 4+ hours of testing, the following bugs/issues appear to be fixed for me on my iPhone 7 running 10.1 Beta 4:
iOSBry
- iPhone 7 Bluetooth and Speakerphone volume greatly improved when compared to iPhone 6S running 9.3.5 - almost the same now
- Random app hang appears to be fixed (experienced repeatedly in the Phone app where tapping on Favorites, Recents, etc. would do nothing until you waited 10/15 seconds - other apps had this issue as well)
- OS feels generally smoother for the most part - could totally be placebo effect, who knows?
iOSBry