The publication date is in the indicia; the on-sale date is on the cover. The cover date was apparently adjusted for an expected delay due to the Independence Day holiday that did not happen.
This issue has variants:
Steel confronts Luthor over Natasha and Luthor's metahuman project. The space castaways escape from Devilance. The Question brings Montoya further into his investigation, as Batwoman watches.
First appearance of Batwoman, in costume, and Luthor's team of created metahumans. This team includes Natasha, Herakles, and four others unnamed characters.