According to the MTA:
F Coney Island-bound trains are rerouted via the E after Roosevelt Av to 5 Av/53 StRoosevelt Island enjoyed 9 consecutive weekends of F Train service to and from Manhattan before this weekend. Good times had to end.
Weekend, 11:45 PM Fri to 5 AM Mon, Aug 12 - 15
Trains resume regular service at 47-50 Sts.
No Coney Island-bound service at 21 St-Queensbridge, Roosevelt Island, Lexington Av/63 St and 57 St.
The Roosevelt Island Operating Corp (RIOC) adds:
The MTA has issued a weekend service advisory for the F train, which may affect travel plans. The Tram will run on a rush hour schedule from 7:00 AM until 10:00 PM to accommodate any increase in traffic. Please plan your travel accordingly and visit mta.info/weekender or call 511 for more information.
For electronic updates on F Train service, sign up for MTA Alerts at mymtaalerts.com.