That’s a guess of The Apple Blog, the Apple Store will get rewritten using Ruby on Rails. If it’s true, that will be another big achievement for Rails and it’ll get even more serious attention.
Apple has been using their WebObjects (based on J2EE) technology for some time. WebObjects has not been a success and I guess Apple is the only company to use it. Since they will be shipping Rails with Leopard, that would be a logical move but writting something as big as the store is not free. I’m not sure they would have any interested to do that.
I didn’t check for such job description on their job board, it’s usually a good indicator of next moves in the company.