It may have been that Previewsworld got tired of changing the dates until they got better assurances from the people at Archie Comics on when it would realistically be released.
Hell, Previewsworld still has a listing for Francavilla's Black Beetle: Necrologue #1 (from Dark Horse) sayingStill waiting for that to come out as well . . .In Shops: Sep 16, 2015