When was the last time Rockstar announced a game at E3? I don't even remember.
Could it be that they were never going to announce anything? Because lets be honest here, people really want a new game from Rockstar, even just an official hint would set people off. Wouldn't they have been better off with a title, a coming soon, with a little bit of music? That alone would get people going.
I just think it's a little odd that a new account on reddit claims to have known that it was pulled yesterday, but didn't make a thread about it until after the conference. Sure.