If BG3 level cap is 12 it will feel like a half baked game. Based on how many maps we can see even with EA, if each map gives you one level- feels like a safe assumption, act 1 will take the player to lvl 6. We have 3 acts so there is NO way that the level cap will be that low. If you take the 6 levels per act as a baseline, you would be able to reach lvl 18-20. That seems a lot more reasonable.
Especially knowing that i hit lvl 4 before even starting the under-dark. No way that entire zone wont get you to lvl alone. Easy lvl 20