I'd hate to spoil the game for anyone. I feel like if we were to do something directly involving Inquisition, it would be as Inquisition agents facing one or more of the main enemy groups you meet early on, the obvious demon threat, or something mostly unaddressed by the title, like Talvashoth or Carta. Well, the latter does come up, but it's in no way an important issue in that installment.
As far as lore goes, I wouldn't expect anyone to know everything. How many people can just sit down and read every single codex the series offers, when you could be murdering dragons and things instead? That aside, most of my own known lore is out of date as well. Thanks to having a crappy TV, I can't really read the codex in Inquisition, so I have to rely on spoken lines or older things I read. Guess I could check wikipedia, but.. Nah.
Anyway, if you want to plan something, PM me or whatevs.
I don't enjoy playing Canon characters either, just to say. Even if I ever wanted to, I'd worry I couldn't do a character justice. To reiterate though, I doubt I ever would want to.