The iPad cockpit revolution has been slow to incorporate data-link weather. Many iPad fliers take their downloaded weather from the FBO and work with that, what 3G they can get in the air and calls to Flight Service.
Datalink weather for the iPad via ADS-B has actually been around for a while (“Portable ADS-B WX,” May 2011 Aviation Consumer), but limited coverage and limited pilot acceptance has mean limited equipage. Now that Baron Services, who supplies the XM weather service to XM/Sirius, has entered the iPad age with their Mobile Link will datalink sweep the iPad universe?