That's not actually the same machine. There is a similar model on the Japanese side. It's missing some extra USB-A connectors and an actual network connector. I think the extra weight is actually because battery technology is different. It is possible that they can't sell the lighter / longer life battery in the US. But, you are right anyway. It's close enough :-) I'm glad they are finally realising that this is a useful configuration for some people.

Hot off the press there's this[0] guy weighing in at 870g.

[0] http://uk.dynabook.com/press/releases/dynabook-europe-porteg...