Uh, so the idigitaltimes article's source is this examiner article:
http://www.examiner.com/article/gta-5-ps4-and-xbox-720-ports-could-be-announced-soon-according-to-report
The Examiner article's source is this gameranx article:
http://www.gameranx.com/updates/id/14043/article/take-two-conference-call-may-reveal-new-info-on-gta-5-and-xcom/
And this is the content of the gameranx article:
In addition to their plans with the XCOM series, the publisher may have something to announce about Grand Theft Auto 5. The game is scheduled for a 17 September release on current-gen platforms. Thus far, Rockstar has neither confirmed nor denied whether it will bring the game to platforms outside of the PS3 and Xbox 360. Fans of the series hope that the publisher will announce a decision to bring the game to the PC and to next-gen consoles including the PlayStation 4.
That's...it. "Fans of the series hope". Great.
Edit:
idigitaltimes also claims an InEntertainment article suggests there will be next gen versions (but they didn't link it..). Found it though: http://www.inentertainment.co.uk/20130419/gta-5-for-next-gen-consoles-details-incoming/
Their source is the Examiner article too, lol.
