Devices like the Chromebook Pixel (which are hi-DPI, touch-sensitive but aren't phones or tablets) show us that the future of the web is too complex for a simplistic approach to responsiveness. It's not enough to think that media queries and a few screen width breakpoints suffice to make your site future-friendly.
In this talk I'm going to propose that responsiveness requires us to take into account the entire context of the user. That means everything from device orientation to bandwidth to identity.