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A new non-instanced PvP zone with Siege Weapons, destructible buildings and multiple objectives with lasting effects. Players on Normal realms will automatically be flagged for PvP when entering this zone.^[1]

The first zone of this type will be Lake Wintergrasp.

From 126. Re: Is world pvp completely dead? | 10/15/2007 05:41:16 PM UTC by Nethaera:

The Lake Wintergrasp zone will be entirely PvP even on PvE realms, it will not be instanced and it will have sieging.

References

1. ^ Details on the zones of Northrend at WoWInsider.com.