The air delivery vehicles to be developed by the program need to meet certain criteria. These include the ability to drop payloads of up to 3 lb (1.4 kg) within 10 m (33 ft) of a target landing spot and cover a lateral distance of over 150 km (93 mi) when released from a stationary balloon at 10,670 m (35,000 ft).
That would require a glide ratio of nearly 15:1 so a parachute (or even a paraglider) wouldn't quite do the job. I'm imagining it'll be something like a self steering mini hangglider or sailplain.
Of course being unpowered the aircraft's range will depend on wind direction (it won't get as far flying into a head-wind). The one thing I am curious about is how they are going to control the direction of the craft once launched if it truly is unpowered.
The bigger the theory the better.