Someone earlier mentioned the letter Z had scales and A had roots/tree-like features in the Z-A logo.
So I'm seeing in the logo a big snake coiled around a tree - like Jormungandr coiling around the world tree, tying in with Yveltal and Xerneas being a reference to the stags and the eagle atop the world tree.
So I'm seeing in the logo a big snake coiled around a tree - like Jormungandr coiling around the world tree, tying in with Yveltal and Xerneas being a reference to the stags and the eagle atop the world tree.