An entry at Addicting Entertainment speculates that Bungie's totally unannounced Halo 3 game will be an FPS MMO hybrid. He lists a series of reasons that take Bungie comments and then apply them to the FPS/MMO formula. He cites Frank's mention of extreme UI work and a method to input text as two things the team was working on with their "next project." The problem with the speculation is that it just doesn't fit within the Halo universe. Why it doesn't is after the jump.

Halo 3 is an FPS MMO [Addicted Entertainment]

The Storyline Expanding from a primarily single player storyline (I'm not counting the dual-Masterchief/Arbiter element of the co-op mode) to go from playing a pretty singular hero to a faceless, nameless character in Halo 3 is pretty incongruent with Bungie's game design. Similarly, the cliffhanger ending of Halo 2 doesn't really lend itself to the beginning of a giant MMO - the story that needs to be told is the battle for Earth. I'd assume that Masterchief, controlled by the players, will be at the center of that final war.

Multiplayer mechanics Were Halo 3 to leap from a single player campaign into an MMO arena, players would choose sides, factions and essentially do battle on Earth first (assuming Bungie is seeking any resolution from the ending of Halo 2).

Would a Halo 3 MMO FPS be fun? Sure, but it just doesn't fit in place with the rest of the Halo-verse.