Wheels
I suspect the wheels will have a new design. Curiosity's wheels have taken a beating.
All being well, NASA will launch the successor to Curiosity Rover in 2020. And this time the agency hopes to prepare samples for an as-yet-blue-sky manned mission that could one day return them to Earth for analysis. NASA says its Mars Rover 2020 project has passed a “significant milestone” – Key Decision Point (KDP) C – which …
Hang on there, we've been sending rovers with microphones to Mars before and nobody thought of sending back the sounds ?
Why ? How can a microphone be of use to the rover without being used to send back audio data ?
Is there some sort of audio map made of the immediate vicinity, for route planning, perhaps ?
The simple answer is because it's way cheaper to do way more science way faster on mars than Pluto and beyond. New Horizons was a glorified drive by because to slow down enough to do an extended survey would have required an immense amount of fuel or to travel there so slowly that the original planners of the mission would be retired or dead by the time it arrived. Mars is close so we can send satellites for a communications infrastructure and a plethora of different probes and landers at "relatively" low cost increasing our knowledge of extra terrestrial science lowering the cost and increasing the effectiveness of future trips further out.
Have one (only one!) to see if it can survive on Mars. Now that would be an experiment. We all know that cockroaches will survive ANYTHING, and this is the place to find out.
Hopefully the one you send isn't pregnant!!
You never know what the scientists will come up with, sounds of a cockroach??