According to the MTA:
F Coney Island-bound trains run via the M from Roosevelt Av to 47-50 Sts
Weekend, 11:15 PM Fri to 5 AM Mon, Feb 1 – 4
Trains run express from Roosevelt Av to Queens Plaza.
No Coney Island-bound F service at 21 St-Queensbridge, Roosevelt Island, Lexington Av/63 St and 57 St.
More information on subway service disruptions this weekend from the MTA’s Weekender. According to this flyer posted inside the Roosevelt Island subway station entrance window, weekend and weeknight F Trains service disruptions
are extended until late 2013. Oy!