This could be considered in an advanced stage, we are currently focusing on system performance (to get the best sound quality) and interface usability.
First we should consider if MPD protocol permits a real time communication between multiple players, with the lowest possible latency. To have a perfect synchronization I think they should rely on a sort of a clock signal... but I'm not an expert so I can't tell you right now.
If anyone wants to contribute to this feature... welcome aboard