I don't think a footprint exists, as of yet. There would be no need for Bell to make one, as the footprint covers all of Canada, and thats all they are obligated to do. I think (but could be wrong) that a footprint will be made, from posts on forums like this, of people stating what size dish they have, and their geographic location, signal strength, etc... It will come, but I think it will take time for enough data to be collected, and dishes to be aimed!
Good luck southern canucks!