Originally Posted by Kiwi Flyer

Nothing useful. Arrival gate depends on the destination of the next flight for the aircraft. Departure will always be a particular airport based on destination (although the future new route SIN-CGK-SYD will depart from a different terminal than all the other Indonesian flights). However, there are lots of possible gates in each terminal.

About an hour before arrival into SIN the connecting gate information will be available on screen under flight path / connecting gates.