Earlier this month, the USCIS issued a memo that informs their supervisors that certain information can be released to a beneficiary regarding his or her family-based sponsor. While, in general, this information will not be revealed, there are exceptions to the rule. Information that might affect the health and safety of the beneficiary (e.g.: that the sponsor is on the national sex offender registry) will be shared with the beneficiary.
If the USCIS decides a beneficiary needs to know more about their sponsor, the beneficiary will be called in for an in-person interview at either a district office or a USCIS office overseas. The beneficiary will then be provided with time to rethink whether he or she will want to be sponsored before adjudicating the case.