MacStories shot another photo of the banner inside the Moscone Center where its Worldwide Development Conference is taking place next week. The photo shows a extremely simple banner featuring a svelte number 7 against a minimalist background. 9to5mac also posted a photo of a banner with an X in the middle, similar to the iOS 7 banner. » More Photos Of OS X and iOS 7 Banners at Moscone West for WWDC 2013