I remember being amazed by pod computer concepts at least a decade ago. At the time it was a hard drive sized brick; basically a PDA with hard drive. You docked it at home, you docked it at work and inbetween it functioned in PDA mode. home and work could both have task specific docking stations and the phone may even differentiate between home and work (for those who keep them very seporate). Given tech at the time, the idea was that your docking stations would have a big processor and additional hardware while your brick had a humble processing power. Fast forward and "PDA" has become "mobile device" but the concept is the same.

Geeks may not be interested in Motorola's implementation if they ship it defective like the logic bombed Android phones. I don't see the need to lock the device down beyond owner's control as a requirement of the concept though. If this did take off, someone would ship a more open device (ie. Nexus vs Droid).