Upon submission of an iPhone app to iTunes Connect for AppStore distribution, they ask for a 512x512 pixel image. Here is what it says next to the place to submit it:
"A large version of your app icon that will be used on the App Store. It must be at least 72 DPI and a minimum of 512x512 pixels (it cannot be scaled up). It must be flat artwork without rounded corners."
So are they going to round the corners like they do elsewhere or not?? The iOS Human Interface Guidelines indicate NOT: "There are no visual effects added to this version of your application icon"
Yet all the images I see on iTunes app store are rounded. Also web version of iTunes show rounded icons, and infact are 175, 175 square with an image mask that has rounded corners: http://a1.phobos.apple.com/us/r1000/050/Purple/49/68/e3/mzi.wijnmlbw.175x175-75.jpg and http://ax.phobos.apple.com.edgesuite.net/htmlResources/2CBF/images/mask175.png.