It has not been announced. However, the ideas are around.
The first SQ A380, number 003, enters service on 28th October, daily SIN-SYD. Singapore has, I think, announced that the second route would be SIN-LHR. This is too long for a daily trip with just one plane. However, it is thought that SQ is willing to serve the route 3 times in a week - as soon as they have their second plane. This is number 005, and is supposed to arrive sometime in January.