They will improve sex, that means instead of just collecting sex cards now we can play sex poker

I should have enough information - clues, at least - to pick the "best" choice as I see it

The best thing is that we cannot choose the best choice and we make mistakes thanks to that and that's what is beautiful about this game. I don't wanna see bioware style of choices in The Witcher where you know everything and just choose to be saint or evil.