Applicants who previously were interviewed for a visitor visa, also known as B-1/B-2 visas, and who were granted these visas can now renew their visas without an interview. This is a new initiative that is being instituted at the U.S. Embassy in New Delhi, India.
This is a pilot program where the consular officers can waive an interview for worldwide non-immigrant applicants who are renewing their B1/B2 visas within 48 months of the expiration of the previously issued visa. Of course, consular officers are not obligated to waive interviews for all applicants; Consular officers still have the authority to require interviews for any applicant, in their discretion.