At this point there is no word if Rogers will included the FM Radio or not. They may but they will not announce anything at all. We just have to wait until a leaked version comes out showing its there or another update that may contain it.
No FM Radio because there's no chip for that in the ATIV S and no Data Sense because Rogers is not supporting it (no support either for visual voice mail since 2 years either). I think the GRD2 update for Samsung devices contains only the improvements for the OS (i.e. from MSFT).
I'm waiting to see the update for my Lumia 920 hopefully soon...
No FM Radio chip? I'm not sure who is spreading this misinformation, but that is not true. Samsung advertised the Ativ S with FM Radio until near the phone's release, when it was determined that WP8 didn't have the function to support the built in hardware.
At the end of the day the update didn't bring the feature and from the track record of Samsung about Windows Phone, I will not count on it... I don't know why people bother to buy Samsung Windows Phone devices anyway.