I'm thinking that everything will be 4WD, and belt-driven from now on. Just more efficient. Personally I think that the design will stay the same for quite sometime. It just seems like the current order of the wasy it's laid out on the chassis works so well. That it will be hard to make it better without making it look retarted, cause we all gotta admit that when something drastically different comes out we call it stupid until we have one, and it actually WORKS!
My $.02