You're right, most have the Absolute logo. Wayward Sons #1 has the Red Giant logo, #4 is mentioned in the article without a picture. "The Villain" isn't in the article but the physical book has the Red Giant logo. And, again, no rhyme or reason to when Absolute or Red Giant appears.
I don't know if it means anything, but, it makes the branding less cohesive.
Until the books hit the stands, it's much ado about nothing.