Ok, here's what I've learned so far from the AH2 beta:
(1) The slats deploy unevenly and there will be some wing wobble. Its a good warning that you're about to stall. If you're not sure if your slats are deployed, just look out at your wing. Nice graphic!
(2) Turning off tracers will improve your gunnery. At least it did for me. The smoke trails were too distracting.
(3) You can raise your head farther in a 109 in AH2 than you could in AH1. I recommend you raise it to open up your forward field of vision, even if you've imported your view settings from AH1.
(4) I can't hit anything outside of d400. Get in close before you shoot. Close-in fights favor planes with guns in the nose.
(5) 2x13mm/1x20mm in a G6 will knock down a Lancaster or two, and still have enough to bat clean-up on an escorting fighter.
(6) 2x7.7/1x20mm in a 109F will knock down a Corsair with a quick burst.
Ok, that's all I've got for now.