I mean, with Tokyo Games Show and Gamescom presumably bringing in more attendance, why not try to promote Sony at two big international spots? And that's not to say they may not have something planned for before E3, see EAPlay for example. It would just likely mean, that they will not take part in the larger picture of the con. Reminds me..strangely, of Nintendo and E3 for 2016, but on a different level.