Hi,
While there is no redirection to the login form, there is a mesage that says that you need to be logged in to use the wishlist:
monosnap.com/file/LXnCDTgxYgzd0wUFUf0V1fk4nFLgTQ
I believe it's nicer to not redirect the user to the login form, display the message, and let him do it if he wants.
Now it's true that it was redirecting the customer to the login form in the past, with the old add to cart system. We'll take your feedback into account to see if we add that possibility back or not as an extra option.