Say it isn't so!
Rockwell Collins says their new moving map needs to be connected to the ARINC bus for some features:
http://www.rockwellcollins.com/~/media/Files/Unsecure/Marketing%20Bulletins%20Rev1/BRS/MBAirshow%204000%20BRS110087.aspx
Virtual pilot's eye view using the aircraft's flight and navigation information. Requires pitch and roll labels to be available on ARINC busses.