I can't wait to read arguments from someone here about 4 party characters will be more tactical /s.
this is my take. It's high possibility it's 4 party character perhaps with 1 added DM. as I said it's a DOS clone. I really hope Larian prove me wrong.
But we will all see

They have already proven you wrong, the graphics art style is radically different from DOS 2, it's rules style is modified D&D 5e very different from DOS2, the setting is, different from DOS2, and more.