I choose to keep myself from getting excited over anything, as information that is given out about any game before its release is there to make you excited and buy the game. Advertisement tactics that work really well. So this drip of companions and speculation is actually a very brilliant way of keeping the game in the gamers eye, reminding them of it's existence and to sell.
So my opinion on the companions is very... sparse at the moment. The only thing I have been really thinking about with them is how vastly different they will act in battle since I don't want to just assume how they would act. But I suppose I can muster up some personal thoughts on them just from the small impressions we have of them, but set in stone opinion of them will wait on actually getting my hands on the game;
Varric: Well, it's Varric. Sure he was swell in the other games and the comic, but he wasn't my favorite. He was a great companion then, and I'm sure he'll be nice come DAI as well, it'll be nice to see if he will keep up that constant sort of snark he does or will finally develop beyond that. His writing was really well done, but I do get bored of the forever sarcasm banter and rather something a touch more meaty, which I'm sure he will provide. He's not winning me over, I had him as a companion before and would rather something fresh, but I can understand his purpose and don't condone his existance at all in the party. I just don't think I'd use him.
Cassandra: I know squat on her, and I never saw her cartoon/animation that focused around her history. From what I have seen of her from the small bit of DA2 and some silly side things I've seen Gaider post about with her, she's okay. I suppose. She's reading as a stick in the mud for me, uptight and attempting to be super srs mode all the time. I have a note somewhere that says if I do plan on putting her on a team to put her on one that has the most silly. Since the silly and the uptight characters have fun banter together generally.
Iron Bull: Hrm, it's nice to have a qunari buddy. He looks fun, when I have my female qunari I'm curious to see how he acts then compared to my first character. But since there's only art of him and his name, I've got really nothing on him. Fella needs a shirt though... then again I don't think all the shirts in the world can bind them muscles.
Sera: Yeah she's my least interested character. A bratty elf that has no culture sounds nothing interesting to me. She's very light on the info, but her art and description I saw one time is like... probably going to have her benched the whole time. I also really don't like her design I keep seeing of her. Shallow shallow reasons but when I see stuff on her I just find myself eye rolling.
Vivienne: I... don't... know how to think of her. She sounds fun and is interesting, since she has much more infomation about her. We've seen more of her and plenty of artwork to history of her, so she has that advantage. But she hasn't really clicked for me, and I wish she did. Maybe she will when I see her in action, as these are all shallow first impressions based on those limited viewings.
Solas: He looks super dorky. I adore his design. He has high potential of being interesting to me because of the whole fade situation and I have been way interested to see more of him. I have been really interested in the situation of the fade and the lore behind that so maybe he'll be the one with the most banter on it (and I am extremely hoping that if Cole is on the spot of companions, those two will just have the most interesting conversations about the fade and the spirits/demons. Huh, I think my peeked interest on him is based around his possible interactions with Cole)
Now the rumored possibles;
Warden: He looks like a wonderful big bear. If his concepts are anything to go by, he looks like an interesting one with the joyfulness, then the somber. My coin is on him being a father type character, possibly near his retirement as a warden? Them final years, maybe a touch of the Duncan in him.
DHMG/Dorian: He looks like he could be fun. Being an outcast in a land of corruption, when normally it's corruption in the DA world that is the quick to outcast, he has that possibility of bringing in a different insight on mages even while being one. Also, stash. This is such a dorky group of companions.
Cullen: I really really hope he's NPC LI. Because I would find him as that 9th companion very sour in my mouth because of a number of reasons. I don't think he could bring anything new in a fight or lore stuff since we've seen what he has been up to. I mean, he's a nice character, but there's no real hook to him, just that he's an ex templar and on your side now after all these games he's been oposite of you. Except not really, since to he Inquisitor he'd be just on your side. Er, you know what I mean. We have enough meatie shields, and if he takes the place of Warden I'ma be real sad... or even more so if he takes the place of....
Cole: Oh my Maker please. Please please please have him be apart of our companion roster. He was grossly interesting in Asunder while setting him up perfectly for a new person. He's such a massive question mark to his existence, a physical spirit thing where nothing has been figured out of him (which you can't take what the characters in Asunder said about him for face value, because they have no idea what he is either and just kept assuming things that the reader would know as complete BS) then he's got a really interesting way of fighting with the whole making people not see him but can be clearly hurt. A sort of 'arcane thief' as someone mentioned before somewhere here. His memories are bonk'd and probably after Asunder he's struggling with filtering out the feels. He is just, guh I think my favorite character in all of DA lore at the moment, he is tied into the idea of a grey demon/spirit. He has massive potential all around to be a great companion, and would be a horrible waste to leave him in the book, or as a minor npc. I bet though, if he is announced, he'll be the last ish one, and will have this really cute way of announcing him along the lines of "Oh he's been here the whole time, what you didn't see him in every single screen shot? See that shadow right there? Yup that's been him in all the shots. He was even on top of the dragon in this screenshot!" But I can only hope.
I think that's all of them. As for say like, Lilianna and the Scribe girl, Liliana I'm getting tired of seeing everywhere. Yes she's a badass bard blahblehblugh wonderful. She's only been in nearly every single book, her own DLC, and the for front of a lot of stuff. I get it, she's cool. Something new please. Scribe can be interesting. I suppose. I mean if she's an npc advisor of trade, welp I'll be all over her just to have a new character to learn about rather then Cullen or Lilianna.