Red Bull managed to test (At Monza) and use at Singapore a DDRS system that went unnoticed by most of the paddock and us technical writers too. It was AMuS the German publication that brought the system to the attention of the world prior to Suzuka.
The tubing I believe may be intrinsically built into the Beam Wing leads to the outer extremities of the Beam Wing where it exits through rearward facing ducts (2 on each end of the Beam Wing, one on the underside which is difficult to capture and the one depicted below)
Under normal circumstances (DRS Closed) the air enters the Beam Wing from the Engine cover and exits behind the Beam Wing at the outer extremities through the 4 ducts. By doing this not only does it help the Beam Wing to create more downforce than it normally would (Blowing the outer edges of the Beam Wing will allow for this much steeper AoA that is sustained by this blown effect) but the airflow also attracts the exhaust plume between the Rear Wing Endplates which helps to 'Seal' the diffuser by promoting more flow through between the Rear Wing Endplates.
This may also be the reason why Red Bull have also reduced the length of the Strakes at the rear of the Endplates. Rear Wing Endplate Strakes are used in order to not only manage the rearward airflow but as a by-product will also effect the flow ahead of them.
In a quest for balance please also read Craig Scarborough's piece on Red Bull's DDRS as Craig believes the system is far less complex than I do: http://scarbsf1.com/blog1/2012/10/15/analysis-red-bull-ddrs/