“Visit Prometea” - Prometea will most likely be one of the planets to explore in the 3rd game.
“Children of the Vault” - I believe they were a cult in Tales From the Borderlands where Rhys became a leader of. EDIT: Disregard that. It was Atlas that he becomes the leader of. Oh and also the Children of Helios.
“We Are Not on Pandora Anymore” - With the 3rd game announcing that you can go to other worlds that isn’t Pandora. Though it’ll still be cool if we can still revisit the place.
“Tannis Is Not What She Seems” - Might have something to do with Prometea? She might either take over the Children of the Vault and use them to take out anyone who comes after the vault or something? Or it might just be the fact that it’s pointing out the obvious.
“Do Not Open the Vaults” - Well there’s bound to be some people who will be resistant to opening the vault and may want to prevent anyone from opening it, because of all the other times that involved opening the vaults.