Since all the talented people have long ago abandoned this company, and EA is allergic to hardcore RPGs a Dragon Age Origins type sequel will never happen. Inquisition was originally a multiplayer only game if that doesn't tell you how detached Bioware is from it's few remaining fans.
The bias enumeration on your account aside, you are referring to this, yes?
"It was a Dragon Age game, multiplayer only, that was in development before Dragon Age II came out. That became the core of what became Dragon Age Inquisition, the techlines, more than any of the development so we've actually been looking at this for a time." - Mark Darrah
As far as I can tell, it seems to have been a Dragon Age game in development but not necessarily the Dragon Age game that was intended to be the sequel to Dragon Age II though that may be because I missed a quote that confirmed or denied it.
From what I know, Dragon Age II was intended to have an expansion pack akin to Awakening but it fell through due to, I think, the poor reception and sales of Dragon Age II which was why plot elements from the expansion pack were merged with the plot elements of what became the sequel's story.
Basically, I think Inquisition was intended to be a multiplayer game but not the sequel, perhaps it had a connection to expansion pack's story as I think I heard something about the expansion pack's story supposedly involving Hawke being chased by the forces of the Divine but that may been fan speculation. After the cancellation of the expansion pack, Inquisition was changed to be the sequel game and so it gained a singleplayer component while retaining a multiplayer component. That's what I think might have happened.