Windows Phone Thoughts: Is the "petfrog" Your Future PDA?

The words "pet" and "frog" do not immediately invoke futuristic technology in my mind. My first thought is that a pet frog would be kinda lame. My second thought, after some deliberation, is the same. There is a reason, however. "Frog" is the name of one of the most influential design firms in the world, and they put this mockup together for Newsweek magazine. I'm guessing they tacked "pet" to "frog" because...people like pets...? Whatever the reason, the concept and design of the device are certainly interesting. The main idea seems to be a series of nested physical tabs that can be pulled out to reveal different hardware. A tab on the top of the device reveals a screen, a tab on the bottom contains a keyboard, etc. A "primary" screen on the front of the device shows system information and navigational elements. The UI also seems to be designed around the "tab" idea.

While the tabs are sort of neat looking, I think it would be cooler (and more space-efficient) to lose the physical tabs sticking out of the top and bottom in favor of a spring-loaded, no effort-required operation. Need the keyboard? Press the keyboard button on the side and it pops out. Need some extra screen space? Thumb the button and it comes gliding out of the top, like Excalibur in the moist grip of the Lady of the Lake. Perhaps I wax a bit too lyrical, but I think the bottom line here is that this thing is a cool idea. What do you think?