This issue has variants.
There is a 16 page fold-out promo insert included in this issue that accounts for the increased page count. On one side it is an 8 page promo poster for Justice League vs. Suicide Squad, on the other side it is 8 pages of promos including previews of Justice League vs. Suicide Squad as well as promos for DC Rebirth Volume 1 Graphic Novels.
This promo insert appeared in many of the DC comics published this same week.