On WBB 4.0 the default box checked is, Yes, my password is
On WBB 4.1 it appears the default box checked is, No, register now.
I think it would be wise to keep the 4.0 default as it makes it easier for people to login. Especially for people such as myself, who have their password saved either in the browser or using a password manager. I don't have to click an extra click.