DX11 is clearly what the industry is used to, can use more efficiently, the Alpha only supported DX11.
so I guess DX12 is after DX11 on the priority list for them, so you can't really judge it by this Beta, but, it's worrying for DX12 future, considering we are talking about DICE which implemented Mantle early on and pushed for the new APIs more than most;
also one aspect that I find worrying about the new APIs, once games drop DX11 is compatibility with less popular hardware (older DX12 compatible and much newer cards, like 5 years after the game is released)