From GamesReviews:"Microsoft’s conference at E3 just finished up and wow I can say that they really stepped up their game! One of the most exciting announcements was The Master Chief Collection which includes Halo 1 – 4, and they brought out everything and then some.
When Halo: Combat Evolved Anniversary came out, the remastered graphics were astounding. However, many were let down with the multiplayer as it wasn’t an authentic remake of the original multiplayer but rather a compilation of maps from several Halo games. It used the engine from Reach which made it feel more modern than classic. This is probably why the crowd went crazy when they announced that the Halo 2 portion of the collection will get the full anniversary treatment including the original multiplayer in its entirety. In fact, the collection will have over 100 multiplayer maps from all four games, all in 1080p and 60 frames per second."