What's going on with the Legion of Super-Heroes in the post-Rebirth DC Universe?

Looks like fans will start to find out this April, as another piece in the long-game puzzle of the post-Rebirth DC Universe falls into place.

DC has provided ComicBook.com with an exclusive look at the Supergirl solicitation for April, which reveals that the character will team up with Superman and Batgirl in April to take on the Emerald Empress. The villain, currently appearing in Justice League vs. Suicide Squad, revealed in two different comics this week that her goal was to find Saturn Girl, one of the founding members of the Legion of Super-Heroes, who was most recently seen (by readers; the heroes don't know this) at Arkham Asylum.

When Emerald Empress said that she needed to find Saturn Girl, Superman's response at the time was dismissive, saying that they would "deal with that later," as he was distracted dealing with the crisis at hand. An editorial note, though, indicated that Superman will be dealing with the question of Saturn Girl in the pages of Supergirl.

Supergirl is, of course, written by Steve Orlando, who will also pen the Justice League of America comic that spins out of Justice League vs. Suicide Squad. It seems likely that he had contact with the creative team of the crossover and suggested Emerald Empress as a potential villain in it to give whatever is happening with the Legion in Supergirl a running start. In March, DC has solicited Batgirl Annual #1, which will team Batgirl and Supergirl together to break into Arkham Asylum. The solicitation teases, "but what they discover—and who they discover—in Arkham will lead to a much, much bigger story!" That book hits the stands on March 29. With Batgirl in tow, April's Supergirl #8 is pretty clearly a follow-up to that story.