The Dept. of State is imposing a cut-off date of January 1, 2012 for China and India EB-1 categories in April. DOS explained that due to extreme high demand for EB-1 visa numbers for adjustment of status (AOS), China and India have already reached their per-country limits allowed under the fiscal year 2018.
It is likely that China and India EB-1 will continue to have a cut-off date for the remainder of the fiscal year, but visa numbers should become current again on October 1, 2018 when the 2019 fiscal year start. However, DOS leaves open a possibility that there could be some future movement prior to the end of the fiscal year, should the level of worldwide demand for EB-1 visa numbers decline.