I use instant sign-in to my xbox as I do not have permanent internet access. Since upgrading to the new experience interface it does not work. When I start the xbox with no internet access the main home screen says no one is signed in. Selecting to sign in has no effect on my profile status. When I go to play a game the game prompts for a profile to be signed in but my profile is showing as already being signed in. So something is happening regarding instant sign-in. It looks like the only way I can play a game is to have internet access so that my profile is properly signed in. If this is the case it renders my xbox practically useless given my limited internet access.