The existing Apple MagSafe cases have hardware (presumably RFID) that identifies the colour of the case (and maybe other info) - you get a short animation on the screen of the iPhone in the same colour as the case when you attach it.
I don't have a wallet, but I'd presume the 'old' wallet doesn't have anything like this, so the phone wouldn't know that a wallet was attached/detached (as opposed to any other device). Maybe this new version just contains the RFID chip that identifies it as a wallet to the phone so the phone knows to store a location fix when it's removed.
I don't have a wallet, but I'd presume the 'old' wallet doesn't have anything like this, so the phone wouldn't know that a wallet was attached/detached (as opposed to any other device). Maybe this new version just contains the RFID chip that identifies it as a wallet to the phone so the phone knows to store a location fix when it's removed.