I'm most likely in the minority here, but I hope the US keeps the physical button. My phone doubles as toddler entertainment on car rides and while I like the capacitive buttons on my DINC2, my toddler finds a way to hit the home button every 30 seconds and I get a "Daddy, it turned off by itself.. HELP!". So, typically, we have to use the wife's iphone for that as she knows not to press the button.
Would be win-win for me, except I have unlimited data, she doesn't. Pretty dumb reason to be excited over a button.... But, at least for me, is a damn good feature