I really hope Dynon comes to the party and allows ADSB in using the standard GDL 90 format. My Stratus ESG+3i ADSB in-out transponder will produce a GDL 90 data stream.
Advanced accepts this already (see http://advanced-flight-systems.com/forum/threads/1411-ADS-B-for-4500 ). I hope Dynon does soon.