There is an 8 page insert in the middle of the book which includes a 4 page promo for DC Rebirth Batman, Detective Comics, and All-Star Batman, and a 4 page ad for Overwatch video game. The insert appeared in all DC titles released this week.
Series continues in Aquaman: Rebirth (DC, 2016 series) #1.
This issue is a variant of
Aquaman (DC, 2011 series) #52 [Direct Sales].
There exist further variants: