Only two things I'm aware of. One, there was a PCM software update on some 08s. Dealer did mine soon after I took delivery in March, not a big deal. Second, there were some injectors that were defective. They would be replaced under warranty if defective. There was a specific part/batch number that was affected (I want to say part number beginning with 73, but do a search to be sure). Not all injectors beginning with this number were defective, but if you notice a problem and had these they would be replaced. Otherwise a great car, I love mine.
Oh, one other thing, some 08s, mine included, did not have their clutch properly bled and the factory may have used DOT 3 fluid instead of DOT 4. I lost my clutch pedal and had to have the system flushed and bled.