This, for me at this stage, is just Baldur's Gate: Some Subtitle. It's got the '3' on the box, but it has little (or nothing) to do with what came before (only my opinion at this point, I'm by no means suggesting this as fact...absolutely not). I don't consider it part of the series and it will very much do and be it's own thing. The '3' on the box is merely there (in my opinion) to prey on the nostalgia many of us may have.
That said, my position could change as more is revealed. I suspect I'll be buying and playing this upon full release (I don't go near anything with 'early access' attached), as it does look like a fun D&D game in all other regards.
I'm glad your open to changing your mind. I feel the same way, I just try not to be as aggressive as you state; I do feel like attacking...