OK, so I am currently running both apps, mostly because (as far as I can tell) I can’t yet do everything in the new app. For example:
I can’t see to find “Routines” in the new app
Didn’t see the equivalent of Smart Apps in the new app; there are a bunch of switches under Automation, but doesn’t seem like the same thing…
I am not really sure how the new app acts as a presence sensor. I followed the directions on the website for the new app, but I don’t see the device listed. I happen to see two presence sensors in the classic app so I need to figure out which one is which.
Custom Automations is what you will use in the new app.
The location services will not appear in the new ST app as a device like presence sensors in the Classic app. It will show in IDE though. Easiest way is to rename the presence sensor in the Classic app.