What is for certain is this is all totally legal under the current regulations as the load tests apply in an area unaffected by the elasticity. I expect the other teams will be querying the RB8's design once again with the FIA but it may take much longer than the last two races of the season to decide how to re-design the flexibility tests in order to outlaw it's use.
All in all I think that it was a great drive by Sebastian to get on the podium having started from the back of the grid but could Red Bull have shown us their hand being too eager to grind a result at the end of a hard fought season?
EDIT: 08/11/12 - After reading comments in several forums/twitter etc I will once again iterate (as I said above) that I believe the flexing of the Nose camera's as pictured above during the ptstop is greatly exaggerated by the damage incurred when Seb hit the DRS board. This however does not explain the movement of both the nose and the oscillation of the pylons in the .GIF of Webber's car further up the page.
AMuS have moved to dispel the rumour of a flexible nose on the RB8 saying: The front 150mm of the nose-cone is always built slightly softer not to exceed max. deceleration 10G during FIA crash test. Noses are made of just 1-3 carbon layers at the tip to pass crash tests. However they also go onto say at least one opponent has asked the FIA for their opinion on Red Bull's flexible nose-cone.