The NFL Communications page, where the official words come forth from the league office, has proclaimed an end to the referee lockout due to the completion of an 8-year agreement effective immediately. They have also stated that ALL Week 4 games will be officiated by regular crews, including Thursday's game between the Browns and Ravens.
The agreement, the longest with the game officials in NFL history, was reached in New York between the negotiating teams for the NFL and the NFLRA with the assistance of Scot Beckenbaugh and Peter Donatello of the Federal Mediation and Conciliation Service. The agreement must be ratified by the NFLRA membership. Under the commissioner’s authority, Commissioner Goodell can enter into this agreement without a vote of the NFL clubs.
The complete release can be read in it's entirety here.