Board Thread:Theories and Rumors/@comment-30938718-20180720095904/@comment-30499831-20180720225041

They didn't change the timeline. It was just a joke: https://twitter.com/TommyAndreasen/status/1017109278128328705

Also the old designs are never coming back

But I doubt the darkness Garmadon saw in the Departed Realm is the Time Twins, or that Lloyd saying the Oni are coming is a lie. It makes the most sense that it continues the Oni plotline.