In 2016, the DC Universe Rebirth one shot teased the incorporation of Alan Moore‘s Watchmen characters into the mainline DCU, specifically that Dr. Manhattan had been screwing with the DCU‘s timeline with his god-like abilities.
2017‘s 4-issue The Button was the next big tease, and just about all it does is tease, but it told a pretty good Batman/Flash story with some fantastic Howard Porter art for what it‘s worth.
#SummerOfShort3