Though the port has not yet been officially confirmed by publisher Activision, it would follow the PC and Mac edition of Guitar Hero III: Legends of Rock, which was developed for those platforms by Aspyr Media and released after the console version.
While Activision did not issue an outright denial of Guitar Hero World Tour on PC, the publisher told GameCyte that "that title has not been announced yet."
Curiously, the listings make no mention of the PlayStation 2 and Wii versions of Guitar Hero World Tour, which were announced alongside its PlayStation 3 and Xbox 360 incarnations. It remains to be seen whether those platforms will be shown in a second entry, a la the ESRB's listings for Guitar Hero: Aerosmith.
In related news, Activision and hardware manufacturer Logitech today announced a partnership to develop and market "premium" instrument controllers for the console editions of Guitar Hero World Tour. The peripherals are set to roll out after the title's release later this year.