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Eh? Elder Scrolls Online wasn't meant to be ESVI. It was meant to be it's own thing in the vein of World of Warcraft or like. The difference here, though, was that they had a different company handle it so that Bethesda could work on other projects (ie. Dishonored 2, Fallout 4, etc.) and still rake in the cash.
And that's kind of why they haven't yet. Revenue's gonna be pretty steady for the next half a year at least. They may have started development, but at best we'll see an announcement by E3 of next year. Maybe.