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We have the description for episode 18 and Jensen gave an interview with some spoilers for upcoming episodes.

Hell’s Angel” — (9:00-10:00 p.m. ET)
THE EPIC BATTLE FOR POWER BEGINS – Lucifer (Misha Collins) takes a trip home and tries to assert himself into Heaven. Crowley (Mark A. Sheppard) tells Sam (Jared Padalecki) and Dean (Jensen Ackles) he has a way to take down Amara (guest star Emily Swallows). Phil Sgriccia directed the episode written by Brad Buckner and Eugenie Ross-Leming (#1118). Original airdate  4/6/2016.

Enstarz reported some spoilers that Jensen revealed at NashCon.

"I will say that coming up there is an answer to a question that's been asked for quite a long time," Ackles teased. "I'm not going to give it away! [You] probably already know."

Shouts of "Rob" and "God" quickly filled the air, but neither Ackles nor Padalecki were willing to confirm anything.

"No, not Rob," Ackles told the fans. "I will say that it is related to Rob, but it is a question that has been asked for a long time."

It sounds like Lucifer returns to Heaven. What kind of reaction do you think he will get? Does Crowley know how to take down Amara? Will Sam and Dean trust him? What question do you think will be answered? Let us know in the comments, the discussion for episode 18 or the spoiler discussion thread.