Bethesda have announced the details to their upcoming DLC for Brink, titled Agents of Change. The big peice of new is the new pack will be absolutely free of charge, and will contain new maps, abilities, customisation options and weapon attachments.

So far no specific release date has been announced.

The new maps will be:

Founders’ Tower – The revolution finally reaches the island’s iconic spire and takes the battle for the Ark to dizzying heights.
Labs – Venture into the depths of the Ark’s original research and development laboratories, a submerged high-tech facility so far untouched by the civil war.

The new Abilities are:

UAV – This stealthy and lethal device allows Operatives to automatically mark nearby enemies on their radar. For more explosive fun, they can even take direct control of the UAV and detonate it near unsuspecting foes.
Napalm Grenade – Soldiers can use this new grenade to cover an area in a sea of deadly flames.
Pyro Mine – Engineers can plant these mines and leave enemies in the epicenter of a massive napalm explosion.
Field Regen Unit – Medics can deploy these units to increase the health regeneration of any nearby teammates.
Tactical Scanner – This universal ability allows players to reveal the active buffs of their opponents, allowing them to pick off enemies more strategically.

The new outfits are:

The Sad Punk – Add a touch of Steampunk to your Resistance character.
The Limey – Bring order to the Ark with this outfit inspired by traditional European police lawmen.

And the new weapon Attachments are:

Bayonets – Gain the edge in melee combat and cause extra damage with these deadly blades.
Weapon Shields – Take cover from enemy fire and prevent headshot bonus damage behind riot-style shields.