There isn't a subform for lore, I'm afraid. I think a lot of us would like to have a clearer picture of how things fit together; I haven't checked the books that came with the CE which may or may not offer any clarity, but in spite of hoping one of them would be a lore book (and a proper map of Rivellon) I fear not.
I'm curious to know if any of the characters we've encountered have any bearing on those in other games, though they're normally quite explicit about that sort of thing such as Zombie Jake turning up more than once.
There is a timeline floating about somewhere though I'm not sure how definitive it is.
I have the lore book, digital copy atm. Waiting for hard copy in mail. I can say the lore book is very well written and detailed. I would give the writing a 10/10.
Unfortunately, and I may be remembering it wrong, it does not go into much detail about anything other than current DOS2 lore. Such as in depth details of the origin stories. Which is nice and very detailed. Would like to see more lore about established characters, i.e. Lucian, Void Knights, Damien, Arhu, Bellegar... etc...
I hope they add some more lore books in the future. For me, the story and lore of the game make the journey more worth while.