Shortly after I discovered a mysterious reference to a "magical quill" in a Pottermore.com CSS file, the line of was removed. Though it would be somewhat surprising given the small traffic on this site that a Pottermore team member was tipped off by my last post, but I don't think that it's entirely out of the question. Somebody within Pottermore took notice and removed the line of code that was obviously not supposed to be there yet.
So the question is: what are they trying to hide?
Again, I think this line of code is indication that on July 31st there will be an online treasure hunt that leads to a quill that will ultimately let user (the first million users that is) to sign up for the early preview of Pottermore...the Quill Quest.