It's hard to tell, but I think those are actually software buttons (I think it's been clearer in other screenshots, and it makes sense since this is exactly how

It's hard to tell, but I think those are actually software buttons (I think it's been clearer in other screenshots, and it makes sense since this is exactly how Honeycomb tablets work/look). So it's arguably more minimalistic than the iPhone (all screen!) but also arguably more difficult to use without looking at the device.