Just a reminder.
I don't recall ever seeing anywhere that D&D 5e would be compatible with AD&D only that you could play the same style as you did with AD&D 1.
I can just see a lot of people throwing fits about this. To my knowledge we are still looking at ascending armor classes (easily converted if you passed 3rd grade math) and 3e style saves or 4e style defenses.
I am sure we will all know more in the next few days, but the things I have been hearing lately are in my mind good (and good for my group of players) but certainly not going to make everyone happy.