Aside from some usual footage of Anakin and Amidala and some Jedi running, it goes this way:
First, after the Lucasfilm logo, we see the camera fly over a desert CGI scenery, then som mountains over which we see a large, cylindrical spaceship fly over.
Then, we see the text "Every general leads in battle...." followed by a clip of Anakin, apparently looking at something.
Then, we can read "Every queen discovers her destiny" followed by a view of Amidala.
The next text we see is "Every boy becomes a man", followed by Anakin looking at the camera, then a bunch of Jedi running around in the wild, then we see Padmé with a lightsaber!
After seeing Padmé holding a purple-bladed lightsaber, we see a clip featuring R2D2 and C3PO - C3PO is in his gold-plated Original Triloy incarnation!
Then, we see a shot of some young man I can't recognize, followed by a Naboo cruiser (the SR71-esque one from EP1) flying slightly over the viewer's POV, then a shot of some towers on Coruscant, and we see a guy who looks like a younger Harrison Ford. (Hmm... maybe Han Solo is in EP3 as well?? I hope this doesn't conflict with any of the EU)
Then, we see a shot of Anakin, then we see a desert building which looks like Jabba's palace, then a shot of Jar-Jar turning halfways around and looking at something off-camera, then we see afore-mentioned Naboo cruiser flying among the towers of Coruscant. Then we see some hooded, cloaked guy walking towards the camera in a temple, and we also see Anakin looking at the cloaked guy as he passes by. We see a clip of Palpatine in the senate, then we see a CGI Lambda-class shuttle flying by in deep space.
Then some shots of Coruscant, then we see Anakin and Amidala kissing each other, some guy walking near the Tatooine sunset, then Count Dooku looking at something off-camera, then a guy looking a lot like Anakin who swings a green lightsaber around and some footage from a space battle. (I can't identify any of the vessels in that space battle) and a door opening to reveal a squad of Mandalorian warriors, wearing armour exactly like that worn by Boba Fett in the Original Trilogy.
As for a closer, we see an explosion with something flying over (I can't get a good look at whatever flies over) - then a very young Jedi Knight (possibly Anakin) igniting a blue lightsaber, aforementioned cloaked guy (probably Dooku) igniting a red lightsaber, then we see Slave-1 flying by, a shot of Yoda and then a dimly lit close-up of Palpatine, in his ROTJ incarnation, then a shot of some man, a clip from a space battle. (This time, I can see a Trade Federation droid fighter fly by but I can't identify any of the other vessels)
Then we see Anakin (or somebody else) against some dark hi-tech background, screaming "OOOOOHHHHHH!!!"
Anyone know anything about this EP3 trailer??
It's supposed to show Alderaan right before it blows up and have the films interact better with the PT.