Heinlein's "Moon" to be filmed?

This report from Sci-Fi Wire says that Tim Minnear, who worked on Joss Whedon's Firefly and Angel series, has been hired to create a screenplay for Robert Heinlein's The Moon is a Harsh Mistress.

Although I've really enjoyed Firefly and I'm eagerly anticipating the feature movie next year, I'm still cautious about anyone adapting Heinlein's work for other media. I'll file this one under "tentative approval".