Don't worry, it really is an old pic. ^^
Black hair are really those, which look good on Kanon.
Or brown, or black with blond stripes...
But he has blond hair a long time ago. Like... when An Cafe released their Candyholic-single. And it came out REALLY long time ago, one of the firsts.
Maybe, if Kanon's hair was always been blond, we all would think now that he looks funny with black hair. ^^
And btw, I want that Miku dyes his hair back to brown. I loved those.