I'm hesitant to agree with you shonuff, but only because we don't know how the encyclopedia is being put together. While I doubt it will cover the questions you brought up, I hope it will be more than just codex pages with pictures.
And kronovan, they said the encyclopedia would be expanded to multiple volumes, so my guess is they'll cover DA3 separately.
I really enjoyed Card's story, and I agree about the art. I actually used Gleam, Duty, and Agmo in an adventure for my group.