I've noticed in the latest version that charm has been replaced by both charisma and beauty, while charisma seems to have taken over the primary roles of charm, I haven't found anything that beauty does. What does beauty do? and is it worth investing in?

I've wondered about that too. 'In theory' it make the most sense if it gave bonuses to some accept/reject checks in dialogue choices. But I don't know if they've written that in or not. 

Either way its the hardest stat to raise, so it doesn't seem bad to work it up.