Will we see more history detail?
As far as Destiny’s Edge goes, I’m sure we’ll get more history on Eir and Rytlock through Braham’s and Rox’s storylines.
R.I.P., Old Man of Auld Red Wharf. Gone but never forgotten.
If you’re interested in that stuff, there are things you can and should do: read the novels, talk to NPCs everywhere, look for interactable objects with information on plaques or in books. The game doesn’t give clear info-dumps (apart from things like the history of Destiny’s Edge’s final battle that’s given in the personal story via the playing kids, which I thought was nicely done) – but information is out there, and not just on the wiki. It’s also optional; if you want it it’s there, but if you’re not interested, it’s not pushed upon anyone.