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So the release date is now set in stone! Feburary 17th for North America and Feburary 20th for Europe!

From Kramez's blog:

Good news, everyone! We're pleased to announce that all of y'all in North America will be able to get your paws on Street Fighter IV starting Tuesday, February 17, while those of you from the Olde Worlde will be able to get in the ring on February 20! Capcom will be shipping the Xbox 360 and PlayStation 3 versions simultaneously, so regardless of your platform of preference, you'll be pounding faces and Focusing through fireballs day one.