Do we expect an Update on the Shadow Isles Lore someday soon?

With the leaked, and confirmed, First few lines from the Swain VGU that is coming up, one such line reveals a rather sorely outstanding Piece of information Swain gives us when he speaks to Kalista.

"The first oath... The one she made to him."

(Source: https://www.reddit.com/r/leagueoflegends/comments/7lgzc4/some_lines_of_new_swain_have_been_revealed/ )

Taking a sceptic first glance at the line makes me wonder, What exactly does Swain mean with this? Does it tease the Upbringing of Kalista as the Spear of vengeance we know and love/Hate (Very despicably hate) Today? Who is "Him"? A Person of importance, obviously, but does she maybe refer to the ruined king?

My personal theory is just that. Kalista, who connects with the souls of the betrayed and avenges them by killing the traitors was betrayed by the ruined king when he brought up this chaos over the now named shadow isles. That she was the First betrayed soul to turn into the spear of vengeance. That she withstood the curse cast upon the entire Island because of the amount of hatred she felt from that treason.

But this being just a theory means it has too many gaps which we will have to get clarified by the lore team. This screams the Need for an updated lore on the ruined king, because as far as the lore is concerned we know only 3 Things. The Ruined king destroyed and cursed the shadow isles. He did said atrocity because of his daughter (Not sure, im speaking from memory alone) And that what we assume was his blade is an item in LoL. We know much about the other shadow isles' characters like mordekaiser and yorick, but kalista's backstory aswell as the detailed upbringing of how the isles came to be the way they are today is still largely gapping.

Back to the main question, Will swain's rework release and all the Things he knows about Kalista tease a possible lore update about her? Or is it just one of swain's many cunning taunts to spike our nerves and patience skyhigh for the lols?