There are lots of rumors floating around about OBD3 scanner features and releases.

OBD3 could be primarily focused on electric vehicles that provide information about toxic gases released during the chemical reaction.
OBD3 may come with a wireless feature where you don't need to plug in the adapter.
It may come with a satellite connection feature that automatically informs the concerned authority about emission checks.
It's rumored that OBD3 will automatically inform the Overspeed to the concerned department.

Source- OBD For Car