Doesn't Sega have something against publishing/making M rated games for the wii now? While HVS probably wouldn't have made it M anyway, I wouldn't be surprised if Sega had some restrictions against it.
Everything I've learned about life can be summed up into three words: It goes on -Robert Frost Wanting: Golden Sun Dark Dawn, Conduit 2, AC Brotherhood
An interview with some random HVS guy confirmed it's going to be T. They are trying to keep it T rated because it appeals to a larger audience and something other. They are doing what they can to keep it T though.