Here's a concept phone based on the Google Android OS. Designed by Tryi Yeh from Taiwan, the Google-G0 is a touch-screen phone with a slider.
There doesn't appear to be a keyboard under it, but sliding it does reveal a camera at the back and large buttons in front. These buttons appear to be little OLED screens that change symbols according to what you are doing on the phone at any point in time, not unlike the expensive Optimus Maximus keyboard from Art Lebedev. There's even a docking station with a huge screen for use at home.
It's a beautiful concept and has features unlikely to appear in a real mobile phone for years to come. But we sure hope a manufacturer will pick up some ideas from this.