Here is Flexonline's betting odds on the O:  
http://www.flexonline.com/2008_mr_olympia_preview/news/553.
I think it will be:
1 Cutler (No way he can lose, even if he is off.  Olympia just don't play that way.)
2 Heath
3 Jackson
4 Wolf
5 Badell
How it should be, if each comes in at the top of their game:
1  Heath
2  Jackson
3  Wolf  
4  Cutler
5  Badell (provided Gustavo comes in as he has at other Olympias where he was in top 5)
Sure would be great if a dark horse comes in and cracks the top 4.  Every prediction I've seen or heard has Cutler, Jackson, Heath and Wolf as a lock for the top 4.