Amazon is releasing the Kindle 2 one day earlier than originally announced. The Kindle 2 product page states now a release date of February 23rd, which happens to be today. Update: Our records show that Amazon started shipping the Kindle 2 yesterday.

The new Kindle 2 eBook reader offers a new slim design with longer battery life, faster page turns, over seven times more storage, sharper images, and a new read-to-me feature.
Other features of the 0.36 inch thick Kindle 2 include 2GB storage, 25% Longer Battery Life than Kindle, 6-inch, 600 x 800 electronic paper display with 16 shades of grey (Kindle only had 4) and still connects only via Amazon Whispernet (3G Sprint network).
Kindle 2 has a high-resolution 6-inch electronic paper display that looks and reads like real paper, which lets users read for hours without the eyestrain caused by reading on a backlit display.

Maybe later today we already be able see if Amazon was able to anticipate the demand for Kindle 2 and has enough in stock to fulfill the pre-orders and the undelivered Kindle 1 orders.
Kindle 2 sells for $359, the same price Kindle 1 was selling for.
More details on Amazon.com.