You've been warned.
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Here's a couple screen caps from the trailer. First, there is a bot to Optimus Prime's left that I don't recognize. He looks kinda like a mad scientist or something! Anybody have any info on him?

I think the next one is pretty significant. While Optimus Prime speaks with Sam, there is a huge spacecraft behind him, poised for liftoff. The Space Shuttle Discovery is attached to the craft, and a blue NASA logo is also present on the large craft.

I'm really not sure about the bot, but maybe he is supposed to be one of the new smaller Human Alliance characters. He's smaller than Bumblebee, so maybe.
As far as the spacecraft, I think it is the means in which Optimus Prime and Co. go to the moon to investigate the Ark crash site and reactivate Sentinel Prime.
Whattaya think?