They did show us a trailer of the game that we've never seen before! In it, there was a kid with a backpack journeying through a forest, when he found ancient drawings of Groudon and Kyogre, who come to life in the screen. Then, a series of short shots of different areas in Hoenn. If I remember correctly, Brendan was shown running through the route before Rustboro, and the intro to the battle with Roxanne was in there, as well as the option screen of Mudkip, Torchic, and Treecko. A cave-like area, and Team Magma/Aqua headquarters got a bit of screen time.