During this time, USCIS will continue to accept premium processing requests for H-1B petitions that are not subject to the FY 2019 cap.
USCIS’ press release says that this temporary suspension will help them reduce overall H-1B processing times in these ways:
-Process long-pending petitions, which we have currently been unable to process due to the high volume of incoming petitions and the significant surge in premium processing requests over the past few years; and
-Prioritize adjudication of H-1B extension of status cases that are nearing the 240 day mark.
Starting April 2, 2018, USCIS will begin accepting H-1B petitions subject to the Fiscal Year (FY) 2019 cap. The H-1b cap is expected to be reached during the first week in April.