Rockstar Officially Not Attending E3
From GTA BOOM Wiki
Further to our post just a few days ago that while GTA V may be at E3 in some form (like a pretty basic promotion in a Take-Two booth) there will be no major announcements about it (such as a PC or next-gen version), Rockstar Games has officially confirmed the same.
@Blouw19 Despite what some gaming news sites may be reporting, we will not be at this year’s E3 expo.— Rockstar Games (@RockstarGames) June 4, 2013
No way will there be any Grand Theft Auto 5 news at E3 without Rockstar being present. So if you're holding your breath for that much anticipated (however extremely unlikely) PS4/Xbox One/PC announcement, or any other news about GTA 5 really, don't!