At Macworld 2007 Steve Jobs pulled the original iPhone from his pocket, held it up high above the stage, and showed off the app launcher-based Home screen... that's pretty much remained the same ever since.
That's not entirely true, of course. Apple quickly added the ability to create WebClip icons for websites, and to re-arrange and delete them. With iOS 2 (iPhone OS 2) they added native apps to that mix. They increased the number of Home pages. They added Spotlight. They added wallpaper. With iOS 4 they layered in the multitasking fast app switcher. They layered in folders. The iPad, and the iPad alone, got landscape Home screen support. With iOS 5 they layered in Notification Center and Siri.
Is it time for something more?