Here you go with another tutorial (this one is for charakters): http://www.3dtotal.com/index_tutorial_detailed.php?id=1763#.VHrho8lSOF9 In the end I guess there isn't just one way to approach it. The thing is, before you start worring about this high poly to low poly workflows, you have to completely understand the basics…
This is the third thread started for this movie. 1st: http://boards.polycount.net/showthread.php?t=70763 2nd: http://boards.polycount.net/showthread.php?t=70802