The new HTC Advantage x7510
Matt Miller has written an excellent overview of the updated HTC Advantage which now sports 16GB of Flash Memory (instead of a Hard Drive) as well as an improved Keyboard and updated VueFLO.
The new keyboard which is incredibly flat has a vibrate function to give some feedback when typing on it.
Matt manages to capture a short video of the device whilst at Mobile World Congress. You can see the video HERE