Looks like DC will waste no time to return Ivy to full villainy after her return in Heroes in Crisis as she appears with a sinister smile on the Year of Villain banner alongside Lex, Joker and other villains:
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The storyline pretty much sounds like Underworld Unleashed or the thing with the Batman who Laughs where Ivy got a people eating plant kingdom.
Maybe it holds some surprises, but so far it looks like staight up villain Ivy is back...ugh