I have done both of these things on my 2011 model. Upgraded my Radio to an XTRONS 4GB/64GB unit and we've been very happy with it since. I'd never touched a car radio before and found it easy enough to do.
The reversing camera was a bit more involved. I can't remember all the steps but it involved tapping power from the reverse light bulb. I used this one, available by a lot of generic brands as 'model 7301'. It's not brilliant quality but it works. There's a small LED that fits next to the camera so that you still get license plate illumination. There are a lot of reversing cameras in different sizes so do measure yours and make sure it's the right size.