hotzenplotz,
SAS has got the right answer but the other version of the story is that, if I'm not mistaken, it's a testbed for the Commanche. It's an S-76 with a FBW Commanche cockpit grafted on to the front of it. One TP sits up front to test the system.
HTH,
B73
Edited to add: Just seen another re-run of the 'CyberCopter' doco on Discovery Wings: Mr Lappos was explaining in detail exactly what the 'Shadow' aircraft was intended for. He can certainly give you further details if you require...!