This adidas NMD style, not to be confused with the super-limited "Pitch Black" pair, was originally said to be releasing in September. That still looks to be true, and today's surprise launch appears to be an anomaly rather than a real case of the shoe's release date getting pushed up.
Follow the "Triple Black" NMDs here to receive more updates on when and where to purchase a pair.
UPDATE 8/23: Finish Line's page for the sneakers has a product number listed that doesn't match the triple black style. It's unclear if the store got the image for the shoes wrong or the style number wrong, but those looking to buy should definitely get in touch with Finish Line to clarify first.