Personally I think Dorian is out. Remember DG didn't seem to remember/know who Dorian was. Of course he could've been faking, but I'm not sure. I think Solas or Vivienne replaced him, and hopefully we'll get an unknown (as of yet) third female mage. (Though I'd prefer female rogue)
(Don't say that too loudly, people will flip!
)
I'd be sad if Dorian was out, because I rather liked his character. Maybe in the next Dragon Age game? If we're headed more toward Tevinter as the series progresses? Another female mage would nice. Another female anything would be nice. Two additional female anythings would be amazing. 
If DHMG is out, then I'm even more convinced that Cullen is a companion. Without DHMG, then there's only one other possible human male, and it's the Grey Warden. Whom I view as an unlikely LI. Possible? Anything is possible. But unlikely.
It bugs me a little how sure everyone is about everything. The Grey Warden is definitely in and definitely a warrior. DHMG is definitely a mage and definitely Dorian and definitely a companion. Cullen is definitely an NPC. Scribe Girl is definitely an NPC. We have definitely seen all possible companions.
People are definitely a little overconfident. Is all that above possible? Yes. But it's not for sure, not yet.
Sorry, rambling rant. I feel better, though. 