I’ve recently stumbled upon a little site cleverly called Designed in California. This site contains the model history of every (relatively recent) model of Apple hardware ever made. The history includes the date of release along with the basic spec information such as processor speed and iSights. If you ever need to know the most recent update to hardware, then just check out the site. It may help you predict when the next revision will appear.
I was sure I'd seen something like this earlier... Hey, there you go: http://www.macosxhints.com/article.php?story=20050810112422666
I have not tested it my self, and if you do, remember to make a backup copy of your app first...
Aww, crap should have posted the comment onto another posting. Sorry.