The Blu-ray and DVD version will be released in Japan on July 17. However, fans in America will get to watch it first at Anime Expo on July 1st. That's more than 2 weeks earlier than the official release in Japan.
Anime Expo 2010 is scheduled to be held at the Los Angeles Convention Center from July 1st till 4th, 2010, The event is the largest anime and manga convention in North America.
On top of that, Rei Hiroe, creator of "Black Lagoon" manga series and artist MELL, opening theme song performer for "Black Lagoon" Season 1 and 2 are among the many guests of honor at the event. Sheryl Nome, or rather her singing voice (May'n) will meet up with Ranka Lee (Megumi Nakajima) and Ozma Lee (Katsuyuki Konishi) at the event as well.
Image and information is from Anime Expo 2010's official site.