I got those pictures from Grahoo. More photos here.
http://www.flickr.com/photos/grahoo/
My understanding is each region (e.g. USA, Asia, Japan) usually has their preference for rules, and imposing strict common rules might be too limiting.
For example Japan uses LiFe while rest of world is on Lipo. In Asia we use 28T Lightly Tuned motors (same as Japan) but USA I believe is still on the popular silvercans.
Here is the 2010 Worlds Winning Car, not so much Swiss Cheese, even had the rollbars:
