what, you've never bought something and then a few months later the company releases a better version of it?
Im sure that if you just recently bought a top of the line 2.6ghz computer system and then only a couple of months later, a new and better 3.2ghz system is released
people typically buy something when they buy it because they want it then and there...
...you wanted your car at the time you bought it, so you chose from the options that were available to you at that time.
it would be stupid for a company to produce a product and never improve upon it - this is exactly what Toyota is doing, they are improving upon something that they've created - giving people a reason to upgrade what they had before, and buy the latest and greatest of new toys