The possible The Walking Dead season 6 spoilers come from a Facebook page called The Spoiling Dead, which is known for getting mostly accurate scoops about the production. However, this information hasn’t been confirmed by The Walking Dead production, so take it with a grain of salt until then.
Now for the spoilers! The information posted on The Spoiling Dead fanpage is allegedly about The Walking Dead season 6 episode 15. Daryl is allegedly on the hunt for Dwight as he feels “guilty” or “angry” about something.
Glenn and Michonne follow him into the woods and find Daryl. Daryl tells them “I'm gonna do what I should have done. For her.” Glenn tells Daryl, “She’s gone.” Glenn and Michonne eventually get kidnapped by The Saviors and someone possibly gets shot.
If you want to read the entire, super spoiler-y post you’ll find it on The Spoiling Dead page here. The big takeaway is a female close to Daryl possibly dies some time before The Walking Dead season 6 episode 15. The obvious choice would be Carol, but Daryl and Sasha encounter The Saviors together.
Maybe their introduction to The Saviors ends in Sasha’s death? The person's death might have left Daryl in a vulnerable place, which could mean he's willing to do anything to save someone he cares about. If Daryl tries to save Michonne and Glenn from The Saviors, it could mean he's the first person to meet Negan's Lucille.