Topics like these remind me of why I despise the Alignment system in D&D (generally speaking, but it can be useful as a quick snapshot) and the Dark Side/Light Side dichotomy in Star Wars (though I dislike it much less than alignment).
Dragon Age, in my view, goes far beyond the simplistic good and evil binary - characters have virtues and flaws, ambitions and fears, and so forth. In the case of Inquisition, I see it like this: Much as with the Origins, you are leading an organization that's primary goal is to put an end to the chaos sweeping across Thedas and plug up the giant hole in the sky. How you go about that goal will likely vary hugely.
Cole strikes me as the most altruisitc character, whereas I can see Vivienne being a bit of a rutheless politician that believes the end justifies the means. Cassandra seems somewhat in the middle. Varric wants to stop the chaos but he's also a nice guy and doesn't want to see innocents get hurt (as seen in the Crestwood demo). Solas is unreadable at the moment, and I suspect that Dorian will likely be a mix of true desire to do good and help people (seems like a decent fellow) mixed with some serious denial about the reality of his homeland (sort of like...Nalia in BG2. I fight for the right side, but I'm also totally socialized a certain way). Iron Bull...really difficult to say - he seems like he'd be cool with mostly anything a bit like Oghren. Blackwall will likely have a strong sense of justice. Sera...she lives in the moment, I guess?
These are all just guesses based off of what we've seen, but my point (and I'm sure others have said it too) is that the characters are far more complicated than just good and bad.