Having a sub out on the Axiom air is an excellent idea for those of us that want to setup a complete System in a room with a small footprint. I love it.
The gateway is a different story but I see Mojo's point. As for Airplay certification I could not care less about it myself but I know the Apple sheep will.

2xAA
M80/VP150/VP160/QS8
4xM3/M22OW/M2OW/VP150OW/4xM3IC/4xM3OW
EP500/800/HSU VTF3/SVS PB2k/SB2k/SB-12