Each faction, if played like a stand-alone series TES game, will have it's own storyline leading up to the main world-wide story. A very large, unique 3 race zone of quests, dungeons, ruins, forts, NPCs, cities, towns, armor types, etc...
They state you can solo it all the way to 50 if you want and you will have the options available to filter your environment significantly to include like-minded solo players.
It is stated that to get to 50 it should take over 100 hours. That should leave significant character skill improvement, exploration and side quests to work on.
Each content update and expansion will provide a semblance of what the DL content provides in the TES series but possibly at a faster rate.
They mention they are looking at to what extent mods will be allowed, so it is going to be in there.
Multiply this by 3 factions... you in a sense have three games.
Without knowing the payment plan it is hard to say what it will cost, but whatever you pay initially for the game and whatever the subscription fee will be... it could be several months of entertainment all under one roof for possibly the same price.
Just one last thought... It won't be 5 years in between games either.
