Collecting terms agreement / new account fields for existing users

If in the future out terms/privacy, etc change how can we collect agreement to new terms on login page of universal login? I have the checkbox working for registration, but am not sure how to customize the login in this way.
If we add more fields to users accounts in the future is it possible to collect this info as well at a users next login?
Using the hosted universal login pages.

This seems like a good candidate for redirecting users from Rules. Have a read through the following documentation for more information:

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