Yesterday, USCIS announced that TPS benefits for citizens of El Salvador would be extended for an additional 18 months, effective March 10, 2015. The re-registration period will run from January 7, 2015 to March 9, 2015.
For more information on the extension of TPS benefits for Salvadorans, you can go to USCIS's website: http://www.uscis.gov/humanitarian/temporary-protected-status-deferred-enforced-departure/tps-designated-country-el-salvador/temporary-protected-status-designated-country-el-salvador