You can get the game from Capcom e-Store, Steam, Direct2Drive, Metaboli, GamersGate, Impulse and other places online today. The classic fighting game gets reincarnated with new features.

Steam says:
Capcom has executed a perfect hurricane kick, landing Street Fighter IV, the latest in the legendary fighting series, on Steam.
Street Fighter IV is now available for pre-purchase at a 10% discount, until the game’s release on July 7th.
Questions abound.
1. Whom did Capcom kick?
2. Why was said target kicked?
3. Was Mega Man involved?
4. Is $35.99 [...]

The Xbox LIVE Arcade title Super Street Fighter II Turbo HD Remix normally 1200 points is now available for Xbox LIVE Gold Members for 800 points.

For those wondering whether your computer can support Street Fighter IV, wonder no more. Capcom has released the specs needed to run their first of three announced titles coming to a Windows PC near you.

Street Fighter IV is still not even in stores yet and Capcom is already promising multiple expansion packs. The first pack is called the “Championship Mode” expansion pack and will be a free update post launch.