This in from Notify NYC:
Notification issued 4/26/13 at 12:00 PM. As part of the New York City Department of Transportation (DOT) project to rehabilitate the Brooklyn Bridge ramps and approaches, a full closure of the Manhattan-bound lanes of the bridge will be required this weekend, from 12:01 AM Saturday, April 27 to 6 AM Monday, April 29. During this 54-hour closure, all Manhattan-bound traffic will be redirected to alternate crossings, including the Manhattan Bridge, Williamsburg Bridge and the Brooklyn-Battery Tunnel, an MTA-tolled facility. For more information please visit http://www.nyc.gov/dot.