Around in the NFL for quite some time now, the CFL has now implemented technology that will allow QBs to hear play calls in their helmets (assuming they aren't hit so hard the technology goes bonkers....)
The CFL made the announcement today: http://www.cfl.ca/article/cfl-introduces-qb-wireless-headsets. How it works is pretty interesting. It's one way communicae, and it shuts off with 10 seconds left on the play clock. Many plays don't get off in that time period so prepare for QBs to still rely on hand signals.
