After E3 there likely will be one. But Our fist look at gameplay will be shown at E3, and very likely will be playable. If its not playable then its very likely be playable at PAX Prime. Hell I wouldn't be surprised if another trailer is shown at Pax East.
Where was this said?
I'm still holding out hope for some trailers released on their site before E3 (and after E3)
Like how Rockstar did their advertising for Red Dead Redemption with the "Gameplay Series" series of videos they put up on their site. Each one explaining a different aspect of the game, combat, NPCs, the world, main character, etc.
I thought that got me really into the game and was a great way to showcase the game before launch.