Excerpt from kombo.com:
The developers at Beenox have said that the fourth Spider-Man will be revealed somewhere between July 22 and July 25. What's so important about these dates? It turns out that Beenox and Activision plan on revealing the fourth Spider-Man at San Diego Comic-Con -- basically the E3 for the comic book community. Shattered Dimensions has produced some positive buzz in the gaming community, so this event is a good opportunity to bring it to the attention of comic book fans. Although they wouldn't budge on who it would be, they did say that it was the staff favorite. Doesn't that make your spider-sense just tingle?
Otherside: I know my spider-sense is tingling!