I am not sure what took this video so long to surface but MacBerryde just posted what they call BlackBerry 10 OS developer secrets. It seems like this is coming from a demo session from RIM with RIM cutting it off in the end. The video is from June so the demo OS is quite a bit behind what RIM is showing carriers but still it gives us some nice visuals of the OS. You can still see the rough edges Thorsten Heins mentioned existed back then along with the way apps expand and minimize to the homescreen.
Check out the video below and let us know what you think.