http://www.autocar.co.uk/News/NewsArticle/AllCars/226011/

The most recent information we have on the LF-A suggests that it will launch with a 500bhp, 5.0-litre V10 normally aspirated petrol engine, mounted behind the driver, and sending power to the rear wheels.

Lexus is also rumoured to be working on a version powered by the LS600h's 5.0-litre V8, 439bhp, hybrid electric powertrain, but that won't be produced until much later in the LF-A's life.

Autocar's sources have suggested that the V10 version will be badged GT500; the hybrid version would likely be called GT450h.