WorthPlaying points out
a job posting for a Lionhead/Microsoft Game Studios Network Programmer that seemed to have indicated there are plans to bring
Fable III to the PC and to provide cross-platform gameplay with the Xbox 360 edition of Lionhead's action/RPG sequel. That's in the past tense because the listing no longer contains the clues they noticed, but apparently at one point the listing indicated the job: "involves converting and maintaining the network code of the Xbox 360 version of this game to the PC, and enabling the Xbox 360 version and the PC version to play together."
Big Download points to a post on
Koku Gamer where they have a screenshot of the ad before alteration.