Cadillac has used this week’s Pebble Beach Concours d’Elegance in California to give a preview of its new 2010 CTS wagon, which is set to go on sale in the first half of next year. Based on the CTS sedan, the new wagon features several unique elements and will be available with a new turbodiesel V6 engine upon its release.

In addition the current 302hp (227kW) V6 engine from the sedan, the new wagon will also be available with a 2.9L V6 turbodiesel although it will be primarily reserved for European and Asian markets. The diesel is a compact, dual overhead cam, four-valve V6 and is rated at 250hp (184 kW) and 406lb-ft (550Nm) of torque.

Fuel economy is expected to be similar to the existing sedan’s 26mpg (9L/100km) highway rating for the petrol unit. General Motors is yet to reveal fuel economy ratings for the diesel and whether it will be offered in North America.

Both engines are matched with either an Aisin six-speed manual or an electronically controlled Hydra-Matic 6L50 six-speed automatic. As is the case on the sport sedan, the CTS Sport Wagon includes AWD as an option.

Unique features of the wagon are a power-operated tailgate and up to 58 cubic feet of storage thanks to the split-folding 2nd row seat. This is reduced to 25 cubic feet when the seats are put back in place. Despite a similar 2,880mm wheelbase as the sedan, the Sport Wagon is 7mm shorter overall.

According to Automotive News, there could eventually be a V-Series performance edition of the Sport Wagon although the timeline for such a product remains unclear.