I have already come to the realization and acceptance that Halo 4, 5, and 6 are not being developed by Bungie and the music not by Marty. While I am not saying I will just love anything 343i manages to make, I do fully understand that this new trilogy will be different than the last and artistic liberties will be taken. Don't get me wrong, I understand and they understand that you cannot stray too far from the proven path but I am very accepting on a new direction. I saw and played what Bungie did for their games and what Marty did for the music. But, I am content with a new direction. Some people complained that the Halo franchise was too stagnant (not me though) in certain things by having the games being so similar. This is a chance to stay in the roots of Halo and go in a slightly new direction. Variety is the spice of life.
I liked the concept art trailer and the music was very nice.