Yes, after the upgrade you’ll sign in using your full IWU email address (Example: firstname.lastname@example.org) instead of your username (Example: joe.doe).
Also, once your new account has been created, you'll need to reset your password before you can login for the first time. You can change your password here. (This is the same password you use to sign in to the Wildcat page and Data Connect. Changing it will not affect your password for Blackboard.)