Does Mage Armor count as armor for Unarmored Defense class features?

@mikemearls Does Mage Armor count as armor for Unarmored Defense class features?

— Bryce Walton (@BryceWalton) January 16, 2016

You use one or the other – rule of thumb, anything that gives you complete formula for AC replaces rather than adds https://t.co/bubCuvAYrC

— Mike Mearls (@mikemearls) January 16, 2016