Wow... what an amazing idea!
There's a new "breed" of billboards that could be used in "new-launch-projects" as shown here on the example of a possible Audi spectacle.
The idea is to display four life-size Audi cars, suspended inside the silver rings of a massive Audi symbol attached to an iconic bridge structure or in front of landmark spaces — the Sydney Harbour Bridge, Brooklyn Bridge, Tower Bridge, Venice.
(Not sure though that they'd allow such a construction to be fitted to iconic sites like the Brooklyn Bridge or Tower Bridge etc.) But the idea is very futuristic :)
(via cool hunter)