I went to a "pre release" showing of the 2012 Colorado a couple of weeks ago at the local Holden agent. It was apparently a rebadged version of a right-hand drive Trailblazer and they didn't know what accessories would be supplied as standard features in the Australian release. If that vehicle is the one they intend to release here, you won't have much trouble with leg room and space in the cabin. Finding a place to put a second battery and/or mount a compressor will require some ingenuity though (there is no place under the bonnet). Overall, they're quite an impressive vehicle. The power and torque figures they're quoting are about the same as the Ranger but with better fuel economy from a new 2.8L diesel engine. Nissan still leads the power and torque race with their 6 cyl. diesel but Holden dealers expect to have a price advantage. GM are still being very careful about what information they release, including prices.
Could be wise to wait until this new engine proves itself before parting with any money but if the new vehicle proves to be as reliable as the previous Colorado and Rodeo models GM are on a winner.
Eric.