Halo 3 is slated for Fall 2007, as the poster would suggest. So, based on past experiences in 2001 and 2004, we can safely narrow that down from "Fall" to "November, duh", right? Well, in our GDC edition of the Fancast, we mentioned how Shane Kim said that Halo 3 will ship when it's finished and isn't bound to console launches or tattooed biceps. He threw out September as an example, then followed that with how it would ship next week if it was done as a means to cover his tracks. Well, we've got some more food for thought in regards to Microsoft's Fall '07 line up.
We're finishing off the year with the world-wide release of Lost Odyssey in December, so that month is covered. Grand Theft Auto IV is hitting shelves for both the 360 and PS3 smack dab in the middle of October, and Microsoft has no intention of releasing anything against that behemoth. So, that leaves Project Gotham Racing 4 and Halo 3 with either September or November. Using the aforementioned logic, you'd assume that PGR4 will hit in September and Halo 3 in November. Well, Shane brought up another interesting point in that releasing a game in September doesn't necessarily hurt sales. Fable came out in September, got good initial sales, and then an additional boost in November. He went on to say that Halo 3 could do the same thing, while coming out before GTA IV and "beating it" like the 360 did the PS3.
So, place your bets now, which of the two is the most likely month for Halo 3: September or November?