"Beneath a forgotten monastery, a clamour emerges from rival Agents clashing to control three sites. There’s more territory to control, but defenders can use the extra real estate for aggressive pushes."
Haven's 'unique' feature is that it has an additional third spike site. This does not affect the number of ultimate orbs on the map; Haven's two ultimate orbs are present in A Long and C Long (Dragon).
In A site tower, there is an empty sniper rifle case along with ammo and a jar of what is assumed to be piss, this might be a reference to Sniper from TF2, who is well known for jars of piss, even being a secondary weapon option for him