Larian Studios Forums Baldur's Gate III Baldur's Gate III - General Pact of Blade and Two Weapon Fighting

The correct answer is "no one knows yet, only that it's different to PnP".

I will mention that a hexblade pact of the blade gets two weapons they can use charisma with, one that they summon and one that they bind to.

And it does look like polearm master might be a good choice, especially since humans start with the proficiency.