I bought a 2012 SE for my daughter. I liked it well enough to buy a 2013 for myself. The only differences between this year's and last year's models I've noticed are two:
1) 2013 has the lane-changer blinker function. On the highway, flick the blinker arm and the blinker blinks three times without having to hold the arm down. Nice feature.
2) This is really annoying. On the 2012, you got two options when you pressed the Car button: Fuel Consumption and Tire Pressure. On the 2013, they've somehow gotten rid of the Tire Pressure display. Now the only way to check tire pressure is the old fashioned way. Unless it didn't work well, I can's see why they got rid of that function.