Where do they discuss SSF4, etc?
2ch forums, blogs, in the arcades, etc.
I don’t know how much Super is being discussed if you’re talking about like top dog players. I know mixi has big groups for SF too.
Can I get a link?
I can’t read Japanese so I can’t get you any closer than that.
Not to sound like a jerk, but if you don’t read Japanese either, don’t even bother trying to find your way there; the language they use will be so full of slang, jargon, colloquialisms, abbreviations, arbitrary grammatical liberties, and general niche interest internetiness that your Google Translate will just churn out sour butter and your Yahoo Babelfish will straight up fart about it.
(so I hope you can read Japanese)