I have studiously avoided being too exposed to the game, so I'm at this time not too sure what will fit into the role-play framework, which I'm sure will be more rigid than DA:O's.
But I usually play female in RPGs. For some reason I'm more comfortable with that, just as I'm more comfortable being a guy on internet. I can't explain it and won't. But I have also noticed that actually a lot of guys prefer playing female.
So it'll be a female. Likely Dalish or Human. I tend to avoid being mage the first time through, since I typically find it to be overpowered generally, but utterly vulnerable in special situations. But mage seems the most natural choice for the game. So mage or not mage still hangs in the air. If not, I'll probably make it an archer. That's what I'd like to do, but I gather that role is pretty well filled in the game already?
With the exception of DA2, where I went the two-handed way (the 'Champion' thing), I've always played a female archer, the first time through (I typically play mage or dual-wielder the second/third time through), in every RPG that would let me, since BG. I like it, since it's usually underpowered and puts me on a fringe. Considering that it looks like a 'lucky sock', since noticeably the other games haven't lived up to expectations as much, I think I'd just do the safe thing and be a female archer again.
She'll be even-tempered, silent and softspoken (pretty much the opposite of myself, who is volatile, demanding, shouts and screams a lot and have zero-length fuse). She'll be well into her thirties, world-wise and weary. Beyond the dreams of a good life or family. What she would have been doing in that explosion is unclear. Maybe she was the cleaning woman? Maybe the game will force some answer to that question. I hope it won't be a person born into power.
Her first priority will always be people. Everything else will ultimately rest on that. She's unselfish, willingly enduring and sacrificing, because she doesn't really care so much about herself any longer. That is really the base for her fearlessness and perceived strength.
She'll probably be pro-mage, because even as mages may sometimes cause horrible damage, she sees a world featuring mages and magic as the better option for humanity in the long run. But that's just uninformed prejudice. The game and game events will ultimately decide this choice.
Romance? She won't be looking for that (part of not really caring about herself), and it will take a very special guy to break through to her. Who knows (I don't), maybe he exists in the game? (DA:O did have Alistair, after all). Women? Her sexuality is at least slightly ambiguous, so it's possible, I guess.
It's a pity Bioware stepped back from DA2's protagonist-sexuality. If they hadn't, I would so have tried to chat up Cassandra.
So, how much of this will the cursed dialogue wheel and voice acting break? We'll see. Hopefully not too much this time.