In recent years, the "Dakotaverse" and "Wildstorm Universe" have been integrated into the DCU. What other DC or Warner Brothers properties should be next? Keep in mind that there are still openings in The 52 assuming the New 52 hasn't destroyed most of the multiverse, which seems unlikely to me based on current information. Personally, I would love for The Watchmen Universe, Batman: The Brave and the Bold Universe/Multiverse (if it isn't already included. Wikipedia lists it, but it lacks citation so I question it's inclusion in the list), Smallville Universe/Multiverse, Tiny Titans Universe, Ben 10 Universe/Multiverse, Space Ghost or Birdman (assuming they're not included in the B:BatB universe), Superfriends Universe, etc.