Wikia

Feral Swiftness
Requires Cat Form Increases your movement speed by X% in Cat Form and increases your chance to dodge while in Cat Form or Bear Form by Y%. In addition, your Dash and Stampeding Roar have a Z% chance to remove all movement impairing effects from affected targets when used.
Usable by
Class	Druid
Properties
Location	Feral Combat, Tier 1
Affects	Movement speed, dodge chance
Ranks	2
Requirements
Points required	None
Spec specific	Yes
Talent required	None

Feral Swiftness causes a cat druid to move more swiftly, and a cat or bear druid to dodge more often.

Rank table

Rank	Movement speed	Dodge chance	Chance To Remove movement Impairing Effects
1	15%	2%	50%
2	30%	4%	100%

Raiding

Full investment in this talent for a bear tank is wise, since dodge is one of the few mitigation statistics available to the role.
On any fight involving movement (i.e., just about all of them except Patchwerk and Saurfang, the DPS boost of being able to get to the mob and get out of fire more quickly will be considerable.

PvP

The speed benefit applies to stealth, which gives a feral-inclined druid great control of the early match, and any other time out of combat.
A great deal depends on range in PvP, and any bonus to movement is invaluable.

/ Patch 4.0.1 (12-Oct-2010): Moved to Tier 1.
/ Patch 3.0.2 (14-Oct-2008): The movement speed buff can now be used indoors.