I hope PvP is as marginal as it is in 11 (though Ballista equivalent would be fine). World PvP in WoW simply bugged me; there was little benefit other than wasting each other's time.
I think issues of instances shouldn't necessarily be separated by server; being able to possibly due instanced content with people outside your server would be an awesome idea (even now, can you imagine the fun that could be had in Ballista if you could match up across servers?)
XI Wiki


