I might take the miracle of tiny, powerful smartphones for granted, but I can't shake the feeling that the iPhone 6S doesn't, at this moment, have the "one big thing" to make people want to upgrade from the 6. That doesn't mean it's not a better phone, of course it isThe new iPhone 6S and 6S Plus look the same (except for the metallic-pink rose gold model) as last year's iPhones. In a lot of ways they also feel the same. But there are hidden advantages at play. The newest, boldest tech is a new pressure-sensitive touchscreen technology called 3D Touch. There are lots of other improvements, too: better cameras. Better overall system speed. And always-on (and I mean always-on -- unless you turn it off) Siri. And, something I didn't even get a chance to test fully: a completely redesigned construction with a reinforced glass screen, which Apple promises is sturdier all-around. We'll get to that in the next few weeks, ,