The event will be at 3PM (PT) on September 4. You can tune in directly at the Nintendo website and watch it live. It will probably be up on YouTube after the event concludes.
According to a brief mention in the newest issue of OPM, Grand Theft Auto V will be running at 1080p on the PlayStation 4.
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Driveclub came out today. I say this in case you weren't yet aware of this fact. You can go to the store and buy it or you can purchase it through the PlayStation Store online.