Yes SQ are still selling daily via Munich as far ahead as December 2015, however it's still very early days for next Winter.
I read some time ago that cargo was a big revenue contributor to the SQ MAN flights. This seems to be a theme on many longhaul flights from MAN and may be the reason SQ seem content to maintain the status quo via Munich for now.
On the other hand their A350s start arriving in 2015 and its capabilities will allow them to rejig their schedules to lots of destinations if they want to, so maybe MAN might see some changes then.