That was just a "commercial" for the Origin 300 series. Its not game footage, its just a rendered video to show off the ship. Atmospheric flight will not be a part of the game, at least on day 1. It might be introduced at a later point however.
This is a quote from Ben Lesnick, one of the game developers. It was posted on CIG's own forums.
In fact, Chris' take on atmospheric flight is one of the things that convinced ME to trust Chris Roberts early on! Because it was something he specifically ruled out -- in the midst of talking about all the amazing features, things that seemed impossible... he was VERY clear that atmospheric flight couldn't be part of the initial game. That it was beyond the scope of his vision right now, although he thought it was cool and wanted to do it someday. Which is to say that Star Citizen wasn't going to be all "that's cool we'll do that" -- it had a specific idea.
I suppose you could say, that at some point we will get atmospheric flight, so the fans will play in then. And you are right. However, because its not there from the inception, thats why some people hate the nose fans,
However if you look at the Connie, it has several turbines hidden behind some doors to assist with landing and takeoff in atmosphere. so the idea of fans on the ship is not unique. I just don't thing it has anything to do with cooling the targeting computers.