http://vimeo.com/10941211 I think this is standard fare for any hardsurface modeler. You actually can't go wrong with just practicing some of the shapes he makes, no matter which 3D program you use. As for highpoly - don't go into too much subdivision too soon.
Amazing work Snefer... you guys should be very proud! Just got the artbook and there is some really awesome stuff in there. As soon as I finish Watch Dogs, I'm all over this game! I'm going to put it on Easy, just so I can be an environment tourist :D