Like when I zone into Cyrodil, every US player has access to the same Cyrodil? or will we divide into 100+ Cyrodil's?
Update:
Found a nice video at "Tamriel Foundry" titled "Misconceptions Regarding TESO Pt 2" that explains server tech, Megaserver and Campaigns:
http://www.youtube.com/watch?feature=player_embedded&v=3diPMG2clXw#!
So for Cyrodil a "Campaign" system is used to join a pvp community.