All the common problems have been address already. You WILL experience the following problems pretty much quaranteed...
1. De-Laminated Headlights
2. Intercooler Pump Failure ( Get a Johnson Pump)
3. Heated Seats (Fix if you want, it will do it again soon)
4. Hatch Rattle (Multiple causes and solutions)
5. Noisey Injectors (Engine Tick) not really a problem. Mine has always done it and have never had an issue after 28,000 HARD miles.
6. Wind Noise at highway speed around Driver's Mirror. (TSB known to dealers) I don't have it, lucky me...
7. Traction (the Lack of any)
8. Rear Tire Wear caused by above Traction Issue
9. Perma Grin (on your face)
10. Crowd Control issues (especially at Gas Stations)
That's about it really. Aside from the Intercooler Pump, there are no known common problems with the powertrain. It's mechanically Bulletproof.