The GMC Acaia is a crossover SUV from GM. The GMC Acadia, Buick Enclave and Saturn Outlook share the new GM Lambda platform. The Acadia went on sale in the United States in December 2006, and in Canada in January, 2007. The Acadia replaces 3 of the 7/8-passenger vehicles on the Pontiac-Buick-GMC dealership network, the mid-size GMC Safari van, the long-wheelbase GMC Envoy XL/XUV, and the Pontiac Montana SV6 minivan for the USA Only. In recent months GM has also announced that the Lambda vehicles will replace the Buick Rainier, Buick Rendezvous and the Buick Terraza, and then subsequently the GMC Envoy and possibly the Chevrolet TrailBlazer, as a Chevrolet variant called the Traverse will go on sale sometime in the fall of 2008.