Topeka analyst Brian White today issued a new research note summarizing his thoughts on the phone he calls the iPhone 5S, expected to be released this summer. Most notably, he seems to have reversed his prior assertion that the next iPhone will have multiple screen sizes, noting that at a trade show in China there was a consensus amongst his sources that the screen size will be unchanged from the iPhone 5. He claims the left side volume and mute buttons will be arranged differently, in line with a parts leak from yesterday, and says the rumored