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.
The submit button has been moved one step to the right, to accomodate the new "Save draft" button, which is now at the extreme left. Otherwise, I think the button order is the same.