You will mostly do nothing but pve until you find the big Zerg that consists of half the players on the server, then lose your stones... Enjoy the load screens
Cyrodiil is mostly dead now since IC and cyrodiil share the same population cap.
I'm hopeful that they will improve IC to make it that small scale pvp DLC that they initially promoted. I've honestly been PvEing more than anything due to all the enemy's stacking on top of each other.
The Zergs are surprisingly worse in IC since there are no seige weapons or keeps to fend them off