Cloud based OS is worst idea ever. If you use it with 3G you still have to have a good data signal just to even use the laptop, not to mention the monthly fees on that, and now they're talking about a fee to use the OS itself too? They better be selling the laptops for $50 if they're expecting the average Joe to pony up another $100/mo to use it for the life of the device.
I think there are some limited, but very real applications for this OS concept. However, current hybrid netbook style cloud computing (where there is a local and auto-cloud backup copy) seems to make the most sense in general.
Toms forgot to post the rest of the story: you buy the laptop at full price, OR at a subsidized price with monthly payments. Nowhere have they stated that the monthly payments are necessary. Hothardware or anandtech did a similar report a while back that told whole story.