I'm pretty sure I've done comps before where motion blur was rendering in the raytraced reflections, but for this comp it doesn't seem to be working. It might be me that's missed something somewhere but I don't think so.
Have a look at the front game (layer 23, Game 05) - the game has motion blur but the reflection of it in the floor doesn't. The floor layer has motion blur switched on. The floor has a feathered mask on it but deleting it has no effect. Raytrace settings set to quality 8, tent.