Inside the rip is part of a blue-gray and yellow image that somewhat resembles the color palette of Los Santos, the Los Angeles facsimile in Grand Theft Auto: San Andreas. It could also be that of Vice City, the Miami clone featured in Grand Theft Auto: Vice City. The fact that the poster also mentions the film is "coming in March" has some people wondering if that's the date when the next GTA will be announced.
Yes, the leap is pretty tenuous, and could just be another example of the random, wacky humor that is the GTA series' trademark. However, it has been shown that Rockstar loves to hide clues of its future plans in advance. One example is the Impossible Trinity achievement in Grand Theft Auto IV, where the protagonists of the two Xbox 360 expansions--Johnny Klebitz and Luis Lopez--meet the main game's protagonist, Niko Bellic