Halo will be returning to the MLG Pro Circuit this fall with Halo 4, and while the game isn't due for release until November 6, it'll be debuting a tad earlier in professional gaming.
The MLG Fall Championship will be taking place in Dallas, Texas, on the weekend of November 2, four days before Halo 4 is officially released. This basically means the Halo community will have a chance to play the game before it's made available to the public.
More details regarding the competition, prize money, format, schedule, competitor passes, and other such vital information will be made available in the coming weeks. Keep an eye out.