I figured I should update this thread with the good news and the bad news regarding Sumthing Digital's U.S. release of the Street Fighter IV soundtrack.
The good news: There's a U.S. release of the SFIV soundtrack. And as you'd expect it's considerably cheaper than the Japanese one.
The bad news: It's missing several tracks from the Japanese release.
Missing from disc 1:
2. The Next Door [1:34]
3. AC Mode Select Screen -Game Arrange- [0:59]
4. Character Select Screen - Game Arrange- [1:03]
Missing from disc 2:
1. The Next Door -Indestructible- [1:34]
7. Theme of C.Viper [3:02]
8. Theme of Abel [2:34]
9. Theme of Rufus [2:52]
10. Theme of El Fuerte [3:11]
I'm not a big fan of either version of Exile's "The Next Door" so no big loss there IMO, though it does kind of suck that the catchy Select Screen instrumental arrangements of it are gone.
The absence of all four major new character themes is somewhat more significant. I quite like C.Viper and Rufus's themes and with those two in particular missing the second disc loses a great deal of its value. I also wonder why in the world those would get cut while all the original stage themes from disc 1 are intact. (I wonder if the U.S. edition's "Staff Role" medley is missing the new character themes as well.)
Anyhow here's the page for the soundtrack at Amazon (via STC's affiliate link) for those who want to check it out and/or buy it despite the deficiencies.
Street Fighter IV OST at Amazon.com