Hi there...
Interphone has just released the new TRIBE unit who can use *ANY* bluetooth intercom-
device to make BIKE-2-BIKE communication. Soo... you can have Midland, Cardo, Interphone or anything else... then you'll have VHF-com - no worries with wires etc!
Check this one out:
http://www.interphone.cellularline.com/en/product_en/interphone_trib.html
...or see the video:
http://www.youtube.com/watch?v=TcITfizUGwQ