Very interesting. Didn't thought before of using the cellular wireless technology for a direct connection. But seems that the demand for this is just popping now with the advent of GPS based positioning and collaboration or peer to peer computing. It seams this application for LTE will take some time still to hit the market, in the mean time, Bluetooth is also an option. A very short range option though.
Direct LTE will be giving extreme power to the Mobile Applications if deployed on the handsets. A range of 500 mts can be said very good for a campus/business activities. May be micro cells will add up more in this regard.