I expect it's just an attempt to get you to move to a new car. Ford tried that a couple of times when I had the Focus. They kept trying to tempt me with a 1.8 Zetec, until I pointed out that I had the 2.0 Ghia and didn't want to take a step backwards.
I did have a letter after I'd had my E46 almost 3 years from a sales guy saying that as most people like to change after 3 years he was enclosing some details of various options and would call me about them later. The only trouble was that his letter was the only thing in the envelope and he didn't bother to call.
