Omg.You lovely people really know how to make someone feel welcome. 
Also this:
Welcome LaiLoranys and stay delurked!! 
GIF:
...totally made my day. 
Now, onto the pictures of Cullen and Alistair, because I love to analyze things needlessly in depth!! 
I think a main problem is that Alistair and Cullen already looked a little alike, especially when you look at the DA2 Cullen and DAO Alistiar pictures you posted. But, looking at the DAI Cullen image, you can see several things that read Cullen as opposed to Alistair.
Now, DAI!Cullen does have one thing that says Alistair, and that's his lips. Alistair's mouth is thinner, and DAI!Cullen's lips have a flattish look. And Cullen and Alistair share a very similar brow shape, but DAI!Cullen's looks more like DA2!Cullen's, to me. DAI!Cullen's jaw is shaded too much for me to get a good look, but it looks squarer than Alistair's.
Whew! There! 
Hahaha awesome - love this. Thank you for taking the time to create this fine analysis.
I see your point and you've definitely made your case. The thing that mostly bothers me is his hairline, and the mouth-to nose-to chin ratio. Both scream Alistair to me. Also-because we can't really see his face due to the unfortunate shading (I mean really. Placing Cullen at the far end of the table, I totally didn't even noticed him the first time I saw the trailer - got completely stuck at Dorian. He looks...delicious..ekhem. - that has to be a crime somewhere.), like you've already pointed out, his jawline is almost invisible.
I really hope his lips will make a return. He'll need them for the tense make-out sessions with my Inquisitor.
hehe
My first thought when I saw Cullen 3.0 was: "MARRIC WALKS AMONG US!"
I mean, Cullen 3.0 looks nothing like Cullen 1.0. I don't think they have anything in common. He looks like I've always imagined Marric. He looks more like Marric than Cailan and Alistair.
I don't really have a problem with that. I guess the designers simply decided to make Cullen the embodiment of his name.
haha yeah he has that Theirin quality to him! Also the out fit looks very regal. I totally mis his sword of mercy flap...ok that sounds a bit suspicious. You all know what I mean though, right? The concept art from the leaked survey? There was a picture of it a couple of posts ago.
I guess the bottom line is quite clear - we need more pictures of him! Different poses, different facial expressions, both profiles (!!)...also a few risqué ones, while we're at it. For SCIENCE.
Thank you again everyone! I was stunned speechless for a few minutes at your kind reception. 
I will most definitely join the discussion more often from now on.
I'm sorry for this late post interrupting any kind of different discussion- I can't seem to catch up.