I have a scenario where a web application is using WIF to manage federated security. The system will get a SAML token from an STS for the authenticated user. The token is only going to contain the NameIdentifier claim (a typical Windows Live token for example). This means that the application itself needs to manage the account information related to an authenticated user.
The application will store the first name, last name and email address of the user. These values will be populated into the IClaimsPrincipal for an existing account using a custom ClaimsAuthenticationManager implementation.