The link may not work, but look at that. The Zune HD 64 has made an appearance on the official Zune website. Seems like Microsoft has something they want to tell us.

A 64GB Zune HD, which doubles the capacity of the previous model and means that we have three models to choose from. There’s no further info on it just yet, but as soon as Microsoft wants to stop teasing us and give us some real info, we’ll let you know.

[Zune]