We don’t know. Nothing is official, nor is anything confirmed. The only indication we have of this is a tweet by Leehoo from last night.: “Please know the fact that today’s performance might be the last for (us being as) ZE:A… Please. Do come” (cr. kimlixus).
During that time, however, Leehoo was highly effected by a series of tweets (as well as Taeheon being in the hospital and the passing of one his friend’s dad) that he was mentioned in by a fan. It was later revealed by the fan that her tweets were never meant to hurt him. (x + x)
He later tweeted more positive messages, saying that he gave everything at their performance and that he would like continue being the leader that singed and danced with his heart. (x) And also tweeted, “I live as your leader, (and I) will die as (your leader). Thank you ^^” (cr. kimlixus).
As you can see, everything is really up in the air right now. All we can do is keep on supporting them and maybe sending positive messages to Leehoo and the members.