It's great they decided not to show FFXIV 2.0 at E3 since E3 will be swamped with big hyped announcements, FFXIV 2.0 deserves it's own center stage independant from E3.http://forum.square-enix.com/ffxiv/threads/46535
besides, by timing the new trailer with the flood of marketing, they can boost interest AND MAINTAIN interest since the beta would be closer to their marketing push, so overall that is a smarter tactic than releasing a trailer at E3 which won't inform people of the complete nature, features and improvements XIV 2.0 will have.
as history has shown, E3 is not the only way to market and sell successfully.
And especially for a genre like mmorpg, online communities will still be hyped for the trailer and XIV 2.0 when they see it in August when that is also the time the website and greater amount of media and information will be available to really show it's much more than what the trailer hints at.
They will still be there at E3 to answer questions I think so that can actually be more informative than a trailer, since people would have to wait months for the beta anyway. So better to keep the marketing, trailer and beta much closer to each other for a stronger and more successful marketing impact!! ^_^