Could be also the protagonist Ryder a N7,like father Ryder?

One time's the fun, two times the ride again?
On topic, I think that was extremely early in development. I don't think we'll see an N7 character (or rather playable) in this game.

Ryder starts less exprienced than Shepard was, so no N7. He might become N7 at the end of the game?

In this video from 2015 the N7 Guy was called the Pathfinder. They still changed stuff. The upcoming novel for example was first anounced as Mass Effect: Pathfinder Initiative and now Mass Effect: Andromeda Initiative.

It's a journey like people already said, a journey to prove you are a hero.

I believe that in this game the N7 designation will only be granted to the most talented and intelligent soldiers, only to those who have proven they are worthy of such an honor. So I think that Ryder will be promoted to N7 Rank in a key moment of the game.

I actually hope that we don't become N7.

Shepard has the logo on the upper right chest while the logo, on Ryder's armor, is near the heart. Was it changed just to be different? Was it changed just for the character in the game? Do other N7's have armor with the logo on different parts of their torso? Its possible Ryder was issued the new N7 armor, but wasn't handed out to other N7's at the time since maybe Ryder was "testing" the abilities of the new armor. Maybe the Alliance had plans to have the armor approved for production, but because the reapers showed up, they weren't able to do that.

Its something I noticed and would be curious as to why.

You earn your N7 designation by playing MP missions starting at N1 and working your way through the ranks.  In order to get the optimal ending and save your family members you have to be N7.  But remember everyday you don't play you lose ranking points.  Alternatively, you can buy the rank on a per playthrough basis for the low cost of 9.99...

Maybe it's a choice. Tbh, it's more of an honour than something that changes who you are, what might change things would be special training, but you can probably get training wihout it.

I don't know, I just hope it's a damn  good story, not much else you can hope for in a Mass effect game.

The N7 could just have been a placeholder for the eventual Ai one.

I think I'm just really excited about the exploration and mission that we are on. Trying to become an N7 in the middle of all that would distract from it. N7s go through crazy training; it should be enough that we have one on the team. I'd rather the N7 designation be a rare thing in the ME universe.

Seconded. The N7 designation is meant to be reserved only for those who have gone through the insane Alliance survival training that regularly washes out even the lucky few who've managed to pass the grueling ordeals that constituted ranks N1-6.

Having Ryder's father have been an N7 graduate would make sense in terms of story, as whomever is organising the Andromeda Initiative would want to send people who have proven they can handle surviving in unknown and potentially hostile territory.

If Ryder's father dies during the story (the devs have implied he's dead or no longer around at the time of MEA), the younger Ryder deciding to take up his armour and/or adopting the logo as a tribute would be an understandable and fitting way to the N7 symbol still appear, but not actually require Ryder to be N7.

Similar to how the various strike teams in ME3 decided to adopt the name of "N7 forces", which Hackett let slide as it was good for morale.

 So its done just to be different? You know what? What? It's Biowares military. They can do whatever they want no matter if it makes sense or not. Have at it Bioware. Carry on.