How has this made it on to the front page of Hacker News?
I think this is due to a mysterious comment about higher than normal shipping costs that Tim Cook made to analysts yesterday. The suspicion is that this is due to the availability of a major new product and some think this might be THE tablet or something else similarly awesome. Could also just be price breaks on MacBooks, who knows.
I'm going to guess it's a refresh of the desktop products (mini, pro, imac). I'd be shocked if it was a tablet release without Steve Jobs announcing it.