Apple's stock has interestingly not fared their press conference today very well, though it seems to be now making a recovery. Hot on the heals of the new iPad mini's announcement, and various other products, Apple's stock price has plummeted down to $619.63 at the time of writing. This is a loss of 2.25 percent.
It's not exactly clear what caused the drop in stock price. The new products seem to be rather revolutionary as opposed to evolutionary, though it could be a bunch of upset iPad 3G owners that are causing the misery for Apple's stock. I know I would be upset if I had purchased a brand-new device that was replaced only 6 months later.
It's definitely a good idea to keep an eye on Apple's stock today, because, even as I am writing this, it is rebounding some. However, the stock price is still below where it was before the announcement.