Some background from Ed Greenwood re: the Tyranny of Dragons storyline, in response to a question from a fan about Tiamat and her status in the Hells, and in the Realms, as the Tyranny story unfolds:
Read the remainder of Ed's lengthy reply by following the link above.
As always, Ed's replies to questions posted at Candlekeep by fans are first relayed to The Hooded One by Ed, and she posts them to the forums.
Ed spent some time trying to get an official answer for you, and at length abandoned that attempt and spun his own (which of course he has the moral and legal authority to do, although Wizards can of course at some future time supercede what I’m posting below). So, heeere’s Ed:
Read the remainder of Ed's lengthy reply by following the link above.
As always, Ed's replies to questions posted at Candlekeep by fans are first relayed to The Hooded One by Ed, and she posts them to the forums.