Engadget laid eyes on a video from the prolific leaksters over at Tinhte, who claim they not only have a white iPhone 4 from Apple, but it’s one with a “test version” of iOS that nobody else has yet seen. It’s difficult to ascertain how legitimate this software is — it could just be a neatly done jailbreak mod — but that site has a track record of getting its hands on Apple gear ahead of the pack. With that said, the multitasking menu shown here substitutes the current use of apps’ icons to represent them with a visual of each app’s open window. You can tap on a window to expand it (replete with animation) to fill the screen or long-press on it to bring up the familiar “x” button for shutting it down. This is all accompanied by a new “Search iPhone” dialog at the very top, which sends you into Spotlight search that looks very much the way it currently does (though it seems to no longer be accessible with a left swipe from the first homescreen as on previous versions of iOS). Take a look after the break for the videos.