I'd say it's safe to assume that the phone based unlocking will work pretty much identically to how the fob works with current Tesla vehicles: You walk up to the car, pull on the handle, and the door unlocks. This is what I will believe unless evidence is presented otherwise.I've not read all the 20+ pages - but weren't there comments earlier on about not wanting the car to be unlocked based on BT just because you are somewhat near by ?
There are also options on the screen that seem to suggest various options for unlocking the doors as you walk up, and locking them as you leave. No one here knows how exactly that will work. My watch is setup to unlock my laptop automatically, and it works very well (if I remember correctly it uses a combination of Bluetooth and wifi and measures round trip time to decide if you're close enough). It has to be closer than about 2-3 feet, so it's technically possible to implement something like this.