That ending is great, I can't wait to see it in English! Bumblebee's response to seeing the toilet paper is priceless!
Travis was right when he said about Hailee's facial expressions replacing dialog. Her expression at the end said "Well, at least we tried" without uttering a single word.
At 40 seconds in, some green sparks are going up the crane in the background. My theory is, that Dropkick, did something to the crane (maybe activated it, or remote controls it). Not only is he in the scene, but the green is the same hue, as Dropkick's voice sine wave.
There's definitely something doing on with that crane, I think someone else pointed out the green lights after the last trailer. I'm not sure it's the crane though...that structure looks Cybertronian. My guess is that it's a signaling device to bring in the rest of the Decepticon army.
Interesting. This can only mean two things: 1. We'll see Bee come down to Earth in the 80s and anything from TLK is no longer canon, supporting the soft reboot theory 2. The Bumblebee Cybertron (or on Earth?) scene is a flashback sequence, separate from the sequence where Shatter leaves Cybertron and arrives on Earth