Why remove the trailer scenes?

[NicoNico]

Well, to answer simply the question OP's asking : because it's a one year old trailer and you actually change things when you work on a project, especially an artistic project. Simple as that.
Remember when the MGS2 trailer was shown. It inclued a sequence where Snake was running away from water flooding the boat. It looked cool. No, it looked awesome !
The game was released and... no Snake running away from water ? How come ? Well, Kojima explained it : it looked cool, but, in fact, it wasn't that cool when you were playing.
Same thing happened with Bioshock Infinite.

So, here's an answer, I guess. It was in the trailer because TCR thought it would be cool, but at some point, they must have realized it didn't fit the game and changed it.
I see alot of people getting pissed off by that but, really, it's an everyday process in every artistic project. You do something. You're poud of it. You show it. And then, some times later, you look at it again and think "you know what ? Now that I see it again, I don't like it that much. I think it's not quite right. Let's change that."

Plus, let's not forget that, a lot of times, some scenes are made especially for trailers. It happens all the time in movies. They take some shots and do some special FX pretty quickly for the trailer so they can show something. Then they actually do the real stuff.
Maybe that's what TCR did : make some scenes to give the idea of what the game would be (more or less) and then actually get into the real process.