A2 milk is just a cow that doesn't produce the A1 beta-casein protein. It has been in Aus and NZ for 10 + years.

Some people particularly children find it easier to digest. (As with goats milk)

It still contains exactly the same amount of lactose.

There have been some recent studies suggesting that A2 milk doesn't cause inflammation in the gut (Where as A1 does) But, these studies have yet to be scientifically validated.