http://www.eurogamer.net/articles/2013-10-10-sources-grand-theft-auto-5-out-on-pc-early-2014
http://www.ign.com/articles/2013/10/10/gta-5-allegedly-coming-to-pc-in-spring-2014
http://www.gamespot.com/articles/grand-theft-auto-v-coming-to-pc-in-early-2014-report/1100-6415514/
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Unless Rockstar specifically comes out and announces a release date, all these predictions are complete and utter bs. An "anonymous source" could be literally anyone. not to be trusted.