This is a place I could see them flexing their WiFi-Direct muscles. I know where I work, getting the AppleTV on the WiFi network is nearly impossible because the last time I checked it didn't support 802.1X certificate based authentication. I had heard that you could pull this off with a provisioning profile now, but I haven't checked.
The main problem is, even if you can get it on the network, Bonjour as a protocol can't jump subnets. Where I work they use subnets like a 5 year old eats tic-tacs. Joining the WiFi could result in you being put in any random subnet in a large set of subnets in the same domain. So even on the same network they two devices can't "see" each other because the bonjour service doesn't scan outside of the host's subnet. WiFi Direct would solve that. It would also solve the problem of getting an iPad on the corporate network, something we're technically not allowed to do anyways.