Since the vehicle design is based on Opportunity, I would say the biggest news is the array of sensor/instruments on board: http://mars.nasa.gov/mars2020/missio

Since the vehicle design is based on Opportunity, I would say the biggest news is the array of sensor/instruments on board: http://mars.nasa.gov/mars2020/mission/instruments/ http://mars.nasa.gov/mars2020/mission/instruments/