MGL Avionics's IBOX supports the wireless IPAD set-up. This is off their website:
"The iEFIS architecture offers a wireless Wifi node that can take the place of any of the theoretical 8 panels you could connect to an iBOX. While this is primarily intended for flight planning (such as upload your flightplan from a tablet) and flight data recording (useful for experiments and aircraft manufacturers) - the wireless node has access to everything a normal panel has so it could become a full EFIS as well, just wireless. It is also possible to consider using just an iBOX without any iEFIS panels at all and a iPAD or Android "EFIS" perhaps for very low cost installations in smaller aircraft."
I like the idea of single vendor solution.
Kebo