Rose McGowen's Big Casting Announcement?

Grindhouse star Rose McGowan has a huge announcement coming soon. The actress told /Film:

I also have another really big one (movie), but I can't say it now, in a week or two.

We pressed her for more details but all she gave us was a smile. What a tease. See Rose in Grindhouse, which hits theaters on April 6th 2007.