was'nt the idea of this project the balloon expanded enormously once it was in orbit ?
kinda reflector for radio signals ?

The goal seems to be to provide a new method of reaching low earth orbit and to place derigable space stations/platforms at suborbital altitudes. What is interesting is the use of silent electrostatic propulsion. I think this may be an effort to bring secretly developed technology into the public forum. This same technology would describe many UFO sightings.