The design process of the 2014 car was highly iterative, meaning the car was completely re-designed about every 2 weeks. There were lots of crazy ideas, like a 5-link rear suspension, that ended up getting scrapped, but helped prove that what is going on this car is as good as it can be. The 2014 Baja has a new front suspension, gearbox, re-designed back suspension, and hundreds of small things to help save weight.
The 2014 chassis was the first chassis to feature out of plane bends. The out of plane bends allowed the main part of the roll cage to be made from a single bar and also allowed for the front suspension to have caster. The front of the chassis was widened to help improve driver comfort. The rear of the chassis is shorter to improve rear suspension and powertrain mounting.
For the first time in 3 years the front suspension was redesigned. For any suspension nerds out there here are the parameter changes that were made for 2014: