Lauras st.mp is good medium AA.
Nobody mentioned Necalli yet?
His anti air jab doesn’t seem to have changed at all in s2.
On top of that he has a very good uppercut to aa with and cr.HP from far ranges.
Kens crouching HP has been very effective for me when I’m not confident about pulling a medium DP (fairly slow/quirky connection speed). It just does less damage but allot more than a jab. I don’t remember losing or trading against a jump in normal attack with it. Against an EX or higher, that’s a different story but I don’t know any character who has a normal that can defend that kind of attack from the ground reliably.
That is a very simple and effective anti air. Pro Gief players use that as an easy anti air all the time.