Capcom has just announced the first Street Fighter IV expansion pack and DLC alternate fighter costumes. 

The first is a free gameplay enhancement set for release post-launch, called the Championship Mode expansion pack, which adds some unique options to SF IV.  This expansion includes three "gameplay enriching" features:

• Replay Mode – Record, upload, and download top matches to share with the Street Fighter IV community. Players can analyze top tiered fighters matches, leave voter feedback for others, and share their own triumphant victories.

• New Points System - Two new points systems to measure your skill (Championship and Tournament Points)

• Enhanced Tournament Matching System - Skill level matching system offers improved tournament match making for beginners and mid-level players. Competitors earn Grade Points (GP) to earn entry into more advanced tournaments.

A few days after launch, players will see more expansions in the form of costume packs.  The DLC alternate costume expansion packs will allow you to customise your fighters in a number of ways, and each bundle offers alternate outfits for a specific group of characters.  They are grouped seperately by themes and, unlike the Championship Mode expansion, will have a download fee. 

• 2/17 – Brawler Pack DLC Pack will include alternate costumes for: Zangeif, E.Honda, Rufus, El Furete, and Abel.

• 2/24 – Femme Fatale Pack will include alternate costumes for: Chun-Li, Cammy, Sakura, Rose, and C.Viper.

• 3/3/09 – Shoruken Pack will include alternate costumes for: Ryu, Ken, Akuma, Gouken, and Dan.

• 3/10/09 – Shadowloo Pack will include alternate costumes for: Seth, M.Bison, Sagat, Balrog, and Vega.

• 3/17/09 – Classic Pack will include alternate costumes for: Guile, Dhalsim, Fei-Long, Blanka, and Gen.

Capcom will be releasing each pack over time, during the end of February and through mid-March.  The purchase price sits at 320 Microsoft Points or $3.99 via PSN per pack.

They've also been kind enough to provide plenty of screenshots.  Check out all 50 images in our little preview of the upcoming DLC outfits!