According to my buddy who works for marketing for EA, he's stated that DLC sales drop incredibly so after the first month of release, which is why they tend to keep DLC closer to release rather than later.
I think Capcom's idea was that they wanted to include a super version of their game, but they didn't want to put out another version of the game and just wanted to send out whatever was there. The problem is that for the people who would buy DLC for it, IE the hardcore fighting gamers, they all kind of hate SFxT now, much to their surprise. Soooo... they're kind of stuck.
(Btw, my buddy is looking to get out of that job because as you might imagine, EA marketing kind of sucks.)
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Xbox GT: PrivateBiscuit1
Down with Zhang. Let there be Biscuit!