Title of 7th Harry Potter Book

I came across an interesting Internet bet regarding the title of the 7th (and final?) Harry Potter book. Only two choices were given for possible titles. Here are the titles and the odds offered:

Harry Potter and the Parseltongue Trophy -$130 (meaning you would have to risk $130 to win $100)
Harry Potter and the Great Revelation -$110 (meaning you would have to risk $110 to win $100)

This is the first I've heard about these two as possible titles even though I guess the news has been out there for a while. Just thought I'd pass it on.