343 Industries' community manager Jessica Shea has been answering questions on Twitter about the studio's upcoming game, Halo 4. Among the queries she's answered was a question about Halo 4's spectator mode—or the lack thereof.
Shea confirmed that there will be no spectator mode in Halo 4. To some players, the omission of a spectator mode flies in the face of the studio's goal to develop Halo 4 as a competitive title, but most expressed their lack of surprise.
Other players were less affected by the news. @GrimBrotherOne dismissed spectator mode as a "waste of bandwidth".
The official response on the Halo bulletin called full spectator mode a "bandwidth hog" that they did not want to introduce into the game's competitive arenas, but promised that there would be changes to the post-death camera.
SOURCE:
http://www.gameranx.com/updates/id/7504/article/halo-4-multiplayer-won-t-have-spectator-mode/