Update: The 2009 Honda Accord Euro (Acura TSX) has been released. Click here for the latest story.

Last month Honda released official teaser images for its next-generation Accord Euro, and now we have images of an actual sedan prototype undergoing testing in California. In the U.S. the car will be sold as the 2009 Acura TSX and will be limited to a sedan bodystyle only. Other markets will get a Touring wagon variant as well.

The images, which were posted on an internet forum, show that the final production model shares many similarities with the current car, including an almost identical glasshouse and profile. Look closer, however, and the new car’s rounder appearance, larger grille and intake, and taller boot become evident.

The all-new Accord Euro will be powered by a range of advanced, low emissions engines, and it will be one of the first cars to offer an entirely Euro 5-compliant engine lineup. Two petrol engines of 2.0L and 2.4L capacities and a 2.2L diesel engine mirror those in the current range, but power output will be boosted and emissions and fuel economy significantly improved as well.

The new model is set to go on sale in Europe by the middle of the year but its Acura cousin won’t arrive in the U.S. until the end of the year. Acura will also add a diesel option for the TSX but it won’t be available until several months after the launch of the redesigned car, which we'll get to see for the first time at next month's Geneva Motor Show.