You literally mean the "Active topics" and "[ Search found 48 matches ]" items? They are just colored that way because of the preference of the style designer. My guess it that black font was used for text that isn't a link and blue/grey was used to indicate active/visited links.
A stupid question, Have the "submit" and Preview" buttons been inverted? After the new forum has been implemented I've found myself many times clicking by habit as I did to submit a post only to find myself looking at the preview.
I'm just curious if that's the case or if I'm just derping around. In any case, that's not a problem, I'll get accustomed to it eventually.
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Sources and documentations are the most welcome.