The reply button under each post is used to make a direct reply to the post. The blue reply button makes a reply to the topic itself.
It is also not new.
Hehe thanks -- we've been going more or less full time on NodeBB since our new marketing site was unveiled. Got some neat things coming up soon
Lightning-quick indeed, sometimes it goes so fast I wonder if my internet connection went down and it's loading cached pages
Good luck guys