Just like the first two and fable II they will realease it on pc about a year after it was released. They just never tell us when untill its like a month before.
Make that two-to-three years.
Halo CE - 2001, Halo PC - 2003
Halo 2 - 2004, Halo 2 PC - 2007
Halo 3 - 2007, Halo 3 PC - 2010?