Off-Set Airline Economy Class Seating

If you take a look at the 3-abreast seating in a McLaren F1, you'll notice the space saving advantages of offset seating: There's more room for three passengers sitting abreast if the seats are staggered.

"A first for the economy cabin, a seat design offering you a truly relaxed sleeping position. It has a contoured shoulder area specifically profiled for sleeping. The shape was derived from numerous prototype and passenger trials to minimise the step-back of the seats. You do not feel like the seats are even staggered, allowing interaction between you and other passengers, while reinforcing a high level of privacy." -ThompsonSolutions

This arrangement allows either 15% greater passenger capacity or 2" wider seats. I wonder which configuration the airlines will use...