The U.S. Embassy in Mexico City has announced that, as of July 1, 2012, individuals seeking to renew their visas at the embassy and consulates in Mexico no longer must attend a visa interview appointment, as long as their current visas are still valid or expired within the past 48 months. Previously, only those whose visas had expired within the past 12 months were exempt from interview.
Note that even those applicants who are exempt from interview under the new policy must still attend an appointment at the Applicant Service Center ("ASC") for biometrics and fingerprinting. Additional details and qualification requirements may be be found at the websites of the embassy and each consulate, including this link for the consulate general in Cd. Juarez.