Should have technically exactly the same interiors, with a differently printed shell, however, for the Japanese market.
If Panny were smart, they'd do one global cam model with different shells and localized manuals. Would keep costs of manufacture down tremendously, make support and maintenenance much easier and ensure same first sales date everywhere. Jan, wouldn't that be a viable proposition?
As for the DVX here in Japan, the controls and menu are in English. I expect the HDX to be the same. I will keep my eyes and ears open and when it is released in Japan I'll let you know.