After the LF-Gh Hybrid Concept at the New York Auto Show and the spy shots we've captured of the car in testing, the shape of the next Lexus GS sedan is taking pretty clear shape. We only have about a month left to wait to see the final product, as Lexus officially announced today that it will show the 2013 GS 350 at the Pebble Beach Concours d'Elegance on August 18.

The announcement also marks the first official use of the GS 350 moniker, hinting that the car on display will be powered by Lexus' familliar 3.5-liter V-6 engine. That engine rates 272-horsepower in the 2011 GS 350, and should hit about the same mark in the new GS.

Fuel efficiency for the standard GS 350 should also be similar, coming in around 19/26 mpg, or 22 mpg combined.

A high-performance GS-F has been hinted at previously, with a 5.0-liter V-8 engine rated at up to 450 horsepower under the hood. A hybrid version of the GS is also expected, as with the last generation of the car.

Taking on the newly redesigned 2012 BMW 5-Series and 2012 Mercedes-Benz E-Class, the 2013 Lexus GS will have its work cut out for it, but with a more dramatically styled exterior and updated interior, it's looking like the fight will be a good one.