AP is streamlined a bit in DOS2, so 4AP is the default, which can be stored up to 8 if you save over turns. Lone Wolves starts with 6 I believe.
So that's a bit different from DOS1 for sure
Correction: AP can be stored up to 6 if you save over turns by default, but if you enable the new Larian Mod which increases maximum storable AP, then you can store up to 8.
Lone Wolves start with 6 AP and have their maximum increased to 8. Glass Cannons start with maximum AP.