Right now, many popular cars are very hard to get a hold of. My wife and I were looking to buy her a new Nissan Frontier. They are very popular trucks, but we simply cannot find one in our region with 4x4 and the other equipment we want. No explanation given except that they are coming off the line slower than normal.
I would postulate that given the horrific damage done to Japan, many of the electronics aren't as readily available as they once were. Until Japan can get back up to speed or another manufacturing country can get geared up, cars are going to slow down. Everything from Harley's to our beloved Mustang's depend on Japanese made electronics.