But I wonder if I could just buy 07 cams and put them on my 06?
No.
While radically different looking, the technology behind the design is solid. Very solid.
I"m really impressed by what I've seen and heard so far, and can't wait to put one through its paces... Some of the faster speeds in the industry, minimal limb tip travel, a very gentle arc and low stress on the limbs as they flex, deflex design and improved "shootablity" even while attaining those aforementioned speeds... It's a winner for me!