Apart from posting current dates, State Department has also added special notes to Visa Bulletin mentioned above. Please see full details below:
D. SPECIAL IMMIGRANT (SI) TRANSLATOR CATEGORY VISA AVAILABILITY
Given the limited availability of visa numbers and the existing demand, the Department expects to reach the FY-2018 annual limit of 50 Special Immigrant Visas in the SI category early this year. As a result, it has been necessary to maintain a June Final Action Date of April 22, 2012. It is likely that number use will require the SI category to become "unavailable" in the coming months. Once the annual limit of 50 visas is reached, further issuances in the SI category will not be possible until October 2018, under the FY-2019 annual limit. The SQ Special Immigrant Visa category for certain Iraqi and Afghan nationals employed by or on behalf of the U.S. government in Iraq or Afghanistan is not affected and remains current.
E. VISA AVAILABILITY
MEXICO E4 and SR: There continues to be high demand in these categories which will result in the Mexico E4 per-country limit being reached during June. Therefore, readers should expect the retrogression of the July E4 and SR Final Action Dates for Mexico. This action will allow the Department to hold worldwide number use within the maximum allowed under the FY-2018 annual limits.