Isn't taking a phone UI exactly what Apple is doing with Lion too? The large icon matrix and "full screen apps" are exactly what you see on an iPhone/iPad. Though it does feel more "optional" on the Mac relative to this video.
If Apple didn't have large multi-touch trackpads on their macbooks with a slew of natural gestures for navigating things like launchpad and mission control they WOULD be mindlessly scaling the iOS UI to the desktop... but alas, they have discernment and strong design.
