Will there just be one "server" for pvp and if it's full you have to wait in a queue or will there be multiple pvp servers going on simultaneously? I think it should just be one to facilitate community feels and it will be nice recognizing familiar people after a while. If it functions like the latter then it would be weird having to guess at how your faction is doing on other servers and quite possibly never seeing a portion of the players. I just don't like the idea that every time you enter pvp you would be placed in a random server. What do you think?

Oops, title got messed up. Sorry!

I think.....
Cyrodil where the PVP will take place will be instanced into 'campaigns'

multiple campaigns can go on at once.
Around 2000 players per campaign
emperor for each campaign

It's funny because I love TES and 90% of the time I am PVEer in MMO's, but all I care about in TESO is PVP. I have no desire for more than 30 days of PVE at this point so they better get this PVP zone right.

Sometimes I love http://tamrielfoundry.com/development-faq/. This is one of those times. Look under the PvP section.