When is the Apple Watch release date?

UPDATE (03/09/15) The Apple Watch will begin shipping on April 25, 2015. Pre-orders and in-store previews for the Apple Watch will begin on April 10, 2015.

UPDATE (01/27/15) Apple CEO Tim Cook said the Apple Watch would ship in April but he did not announce a specific date.

UPDATE (08/09/14) The Apple Watch will be available starting at $329 in "early 2015".