ripped straight from:
http://www.gminsidenews.com/futureguide1.htm
The H3 will arrive in late 2005 as a 2006 model. It will start the first year with one powertrain, the 3.5L I5. Starting in 2007, the 3.5L will be replaced by a new 3.7L. A Turbo version of the 3.7L will be available in 2008, as the H3 Alpha.