You can definitely expect to learn more about how Ostia's relationship with the rest of the Shattered Isles has been affected by the power shifts there.
Combined with the recent arrival of and revelations about the historically significant Paradox Breaks (and Paradoxicon), it's got a lot of people uncertain who is looking out for them on the frontier, and in the case of all that time travel, some of them don't even trust their own histories anymore.
But as far as Ostia goes, one of the triggers for the Seismic rebellion was the Triumvirate pulling back protection for Ostian settlers. Who's been looking out for them?
ETA: The thought occurs that you might also be talking about physical lore items (okay, I was reminded!) we have several new
ones lore nodes coming soon that will also launch some new quest content that... I am not sure we have talked about yet? But it's a little different and pretty lore-heavy. unlocks more new, straightforward quests to craft the (existing) exotic weapons and helms. We also have a Chronovore lore blog that recently launched, some relevant Journal entries related to the Paradox Breaks, you may find some revisions to the Middleman and Arkan Drew Journal entries, heck, even the island and gear descriptions have quite a bit of story squeezed into the space.
Let us know what sort of lore content--subject, format, how much gameplay might be involved--you'd like to play. We're always looking for more ways to add more!