No, people expected those answers because there's a big gaping hole into the Fade from Thedas. Not exactly far fetched to expect answers when the most famous situation in the whole Thedas universe occurs for a second time.
Yes. Tons. How they communicate, that they were actually imprisoned beneath the earth, how they are tainted, that they can body hop but not into a grey warden, etc.
Not yet, but we have learned a lot about the Qun, and more is sure to follow.
Partially, yes. We know at least some of the things it can do and what the cost is.
Because mysteries are meant to be solved. Not solving a mystery is a failure and pointless. Stories are all about answering questions.
Yeah but we don't have to know the truth about a city with connection to every surface culture that we know of. (excluding the Qun/Kossith) and just because it has connection to all these cultures doesn't mean we will get some big revelation this game about it. they will want some mystery to come from later games.
Not on any of the main quest of DA:O were we sent to go learn about the old gods. anything we learned was from the codex, or occasional dialogue. And the body hop isn't about the Old gods its about the arch demon(Yes i know they are the same entity. but they are not the same creature. since they are powerful enough to leave their prison and command an army). which again is only an enemy we see twice, never truly communicate with, never speak to, and never learn of its intention except that historian think it just wants to destroy the world.
What did we learn about the Qun? they accept Elves? they own Par Vollen? the only thing we really learned about the Qunari was stuff about the Saarabas and the Tal-Voshoth.
And no. stories aren't all about answering questions. they are about journeys. and that's what the dragon age saga is, a journey. You find out one thing in one game, the game after that you find out a bit more that ties in, then a bit more. They don't throw every answer at you in one game. then randomly make up some more. this isn't crap like resident evil, where they just make up crap every game. they plan ahead so they know where the story was going.
DA2 left us with many questions. what is red lyrium? where are the Warden and Hawke? whats going on with the MT war? What are the seekers goals?
All those questioned unanswered. so why do you think DA:I will just wrap everything up in a snug bow?
We know they aren't planning to end here. this isn't a trilogy. these games just happen to follow a bit of the trilogy guidelines, that's all.