We're only certain that it implements HBAO+ and TXAA. Beyond that, we don't know.
Yes, that is all that is integrated. Both options have alternative settings... They are not forced on you. In fact neither tech is even a default option in any preset or for any GPU. You have to explicitly choose to run them manually.
Both are just adding features to the game not removing them. HBAO+ runs at the same speed on AMD and NVIDIA.
Big scandal, huh?