The good news is don’t have the problems others are reporting. I did have problems but (succinctly) I solved some issues by shutting my Raspberry Pi 3 down totally for ~15 minutes (to fix Zigbee not working at all. And maybe other issues.) I solved time issues in rules by configuring the new localization settings. I have WiFi and Zigbee things. All of them work.
The remaining issue is my Timer things are showing as being disconnected. Any of the rules that use them don’t work now.
Oh, I changed Celsius to Fahrenheit in localization (thanks!) The temperatures now display as Fahrenheit. But editing rules that involve temperatures doesn’t work well. The edit box isn’t working well in rules.