IMO, that concept design is not ideal for one main reason: It wastes space with the "kickstand" and takes away from the screen size. Look at the EVO. There isn't much "wasted space." There is a space on top for the speaker, and a slim line of buttons at the bottom. What does this mean? More screen space, which is key for me. Max out the screen space. That's why I have to roll my eyes when I see various phones out there today. What a huge waste of space the iPhone has for both its speaker on top and its single button on the bottom. Those cut into potential screen size.
I'd imagine that soon, there will be a phone with a display that goes all the way to every edge. That's ideal, IMO. Give me an EVO-sized phone with a 4.6-inch display, instead of 4.3.