Whoa! An OS with a filesystem! Wow! How 1984! LOL 
Just kidding. The hub thing actually does look like a cool idea. Seems like a combination of app-focused and content-focused UI. Apple (who's iPhone/iPod/iPad are 100% app-focused) may actually have something to learn from this UI. I wonder though... how do you install new apps on it? If you download a YouTube app... does it know that it belongs to the video "hub"? Or do you have to assign it to the video "hub"? Where does the app live? And I notice on one of the screens there is a "Files" folder. Probably a bad idea. I'd have to play with the actual interface to decide if I like it or not. But at least they are doing some fresh thinking and not simply copying the iPhone.
Just kidding. The hub thing actually does look like a cool idea. Seems like a combination of app-focused and content-focused UI. Apple (who's iPhone/iPod/iPad are 100% app-focused) may actually have something to learn from this UI. I wonder though... how do you install new apps on it? If you download a YouTube app... does it know that it belongs to the video "hub"? Or do you have to assign it to the video "hub"? Where does the app live? And I notice on one of the screens there is a "Files" folder. Probably a bad idea. I'd have to play with the actual interface to decide if I like it or not. But at least they are doing some fresh thinking and not simply copying the iPhone.