The blurb was spotted by NeoGAF in the latest issue of the magazine, which promised,
"Time’s up, says The Ball. Expect Grand Theft Auto V to be announced later this summer."
Rumors about Grand Theft Auto V have been rampant over the last year and a half, even being tied into the Wii U's announcement by Nintendo. The strongest evidence that such a game is currently in development has been a from Rockstar for roles that seem to belong in the GTA universe.
We'll keep our eye out for confirmation in the future.