i wanted to know if they kept alpha shot(leaning feature in the game) i heard they confirmed that they kept it but i have not seen anyone use it in the vids yet
did they keep alpha shot?
Well you heard right and I am not sure why you ask this if you already heard it is still in.
Except for that MGL player showing of some nice light moves every player I have seen so far had no idea how to play the game. I am guessing that is why you never saw leaning being used in these early streams and videos.
Just for clearance, with learning do you mean that the AI will just be able to use everything that is available to you, or real learning AI, that will adapt to the player, and copy your most effective playstyles?
They are talking about leaning, as in peeking out around corners, not learning 
Leaning not learning!
If you are behind cover you can lean to the right or to the left and shoot without moving your whole body. If it works like in Quake Wars your aim will be slightly restricted (because you lean to one side) and only your upper body will be visible.