So wait this Windows thing is like a bootable Wine?

When this started popping up, I made an account that I don't use for anything else but logging in, so for me there's no change at all. Is there more privacy concerns or other spy shit that I'm not considering?

Edit: I guess now I'm forced to be online just to login? That kinda sucks, but I'm sure there's more for everyone to be up in arms about it.