According to the MTA:

F Coney Island-bound trains run via the M from Roosevelt Av to 47-50 Sts
Weekend, 12:01 AM Sat to 5 AM Mon, Jun 18 – 20

Trains run express from Roosevelt Av to Queens Plaza.

Trains skip the 21 St-Queensbridge, Roosevelt Island, Lexington Av-63 St, and 57 St Stations.

For service to these stations, take the F to 47-50 Sts and transfer to a Jamaica-bound F.

For service from these stations, take Jamaica-bound Fto Roosevelt Av and transfer to a Coney Island-bound F.

Expect crowded Manhattan Bound Roosevelt Island Trams. Plan accordingly. UPDATE 12:20 PM: In response to my inquiry, Roosevelt Island Operating Corp ( RIOC ) Vice President of Operations Fernando Martinez reports:

The MTA did not inform us about the service disruption. But, yes we are running both Tram cabins. You should have received a RIOC advisory early this morning.

and

Yes. Both the Tram and the Red bus will have extended service.

UPDATE 8 PM – From Mr. Martinez:

From 5am to 6am, the Tram crew will perform required system checks and maintenance. During this time, the Tram will not have scheduled departures. The Tram crew will, however, make a trip if necessary.