Those sneaky boys and, well, boys from tinhte.vn aren’t done showing off the test build of iOS 4 they have on their factory white iPhone 4 with 64GB of storage. In this brand new video, we can clearly see Facebook integration into the OS as opposed to being in an app (could it be Facebook contact syncing is finally coming, as reported months ago?) in addition to a new File Sharing option in the settings app. Dragging apps to create folders also shows us a brief look at a redesigned folder UI, though we doubt that’s final by any means since it definitely looks unfinished. Plus, there’s also that spiffy new multitasking Expose-style view — who could get enough of that? Hit the break for the video.