I know this has been discussed, the fact that GTA V might be released on may fifth, and there is good reason to believe this.
Release date of 25th May 2012
1. The trailer shows a number plate with 2504 on it.
2. The album of the trailer's song was released on 25th May.
3. There was a poll on this network mentioning 1102, 555, 204. 11/02 turned out to be the release date. Adding 204 days to 2nd of november gives 24th of May 2012.
I don't really see how the last one would be relevant, but i've found something else, if you look at may 5th on the calender, what day does it fall on?
Or as it is abbreviated on your calender: