Sounds! from official trailer...

[Specht]

Originally Posted by Alien

They're added after record, I'm 100% sure. Remember that old Pacific Fighters trailer???

This time, Alien is absolutely right.

[BMCha]

I think I remember reading that much of the trailer's material was captured off an older beta, meaning that the sounds were added in later.

Hopefully the real sounds will be of a similar quality.

[Flanker35M]

S!

Would not be the first or last trailer of a game using other sounds than in-game ones. Or beefed up in-game sounds.