This is good news for comic book stores, getting these ahead of national retailers like Best Buy and Target - however, the main Previews page still lists shipping date as September: previewsworld.com: "In Shops: 9/2/2015".
I am assuming that they just haven't updated their individual listing.
Upcoming Releases For 7/22/2015
Tuesday, July 14, 2015 10:24:37 AM
Every week, PREVIEWSworld announces which comics, graphic novels, toys and other pop-culture merchandise will arrive at your local comic shop. The products will be on sale in comic shops on the indicated date. This list is tentative and subject to change. Please check with your retailer for availability.
MAR158509 DEATH OF SUPERMAN HC DVD & BLU RAY SET PI MAR158507 JLA EARTH 2 HC BOOK & DVD BLU RAY SET PI MAR158508 JUSTICE LEAGUE VOL 1 HC ORIGIN BOOK & DVD BLU RAY SET PI MAR158510 WONDER WOMAN GODS & MORTAL HC BOOK & DVD BLU RAY SET PI