Traditionally the major Grand Theft Autos have hit the PC around 6-8 months after their console splash.
Some Euro retailers have cited a release this fall but Rockstar are keen to reply with zippo’ in the comment department and generally stone wall the idea with trademark silence.
The idea started from French and German retailers, which have posted dates like October 2008 and November. "The release date for GTA 4 for PC has not yet been confirmed by the Publisher, Take 2. The release date is not guaranteed and is open to change", stated , a German retailer, alongside it's prediction of a October 30th release.
It was bound to happen once the console versions were released; PC fans and retailers alike have gone into overdrive with speculation and whispering prophetic visions. Most if not all will pray for a PC release, let's hope Rockstar plan on sticking with past migration trends.