It’s on GamersHell in HD, and it’s bloody massive. Weighing in at 706Mb, the footage is actually amazing, showing what look to be some fairly faithful reconstructions of the battles from the New Line movies.
There’s even a bit at the end with Legolas jumping all over an oliphaunt. Flying things, running around things, the Gates of Mordor: the fantasy Battlefront adaptation has it all. Expect more from E3.