So as we draw laboriously closer to an update on GTA V, i'm just going to post my theories in here for no apparent reason and then never check this topic again. (I am still going by my original assumption that GTA V will be released in October, I am not deviating from my assumption as it is just that, it is no more than a hunch. So don't expect factual evidence because you will find none.)
In regards to the timetable of information breakdown, my supposition is thus;
Mid July - Second trailer released
Mid/late August - Third trailer released (also screenshots released to the fansites.)
Late September/early October - Possible fourth trailer released/official website goes up
Late October - GTA V released
That's three months worth of new information before the game is released, which to me is a realistic outlook and also the most credible one.
There, i'm done. (Also, honkys.)