I think that the ‘Post Comment’ button would need to be styled as it just doesn’t look right now. I do agree, however, that it would need to be styled differently. Maybe the same ‘size’ as the other buttons, but in a ‘not-so-vivid’ green – green for go?
Aside from the slight issues I mentioned earlier, I really like the new style. Really nice how the bright colours bleed through depending on which page you are on.