User blog comment:Timeoin/Elder Scrolls Online: Lore Revealed/@comment-4043978-20130929171228/@comment-5469467-20130930012117

Let me think. I recall talk that players can switch factions later in the game, meaning a single character can eventually access content for all three.

My interpretation is that there will be 16 different individual dungeons, and another 6 "master" ones (which might be harder than regular ones, but I'm honestly not sure). I don't know if that's per faction or overall.

I know that the entirity of Elsweyr won't appear, so it's possible we'll only see parts of most provinces. Not sure about Cyrodiil, though.