git-diff new files (without using index)

One thing I often want to do is generate a complete diff of all changes, including new/removed files.

If I add things to the index, I can use "git-diff --cached" to do it; however I'd actually like to be able to do this _without_ updating the index; in other words, any un-added new file as a change. As it is, the "non-indexed" state seems kind of a second-class citizen, as you can never have new files there (or rather, git will never really see them).

Is there anyway to do this currently? If not, maybe something like a "git-diff -N" (mirroring diff's -N/--new-file option) option could be added to do this?

Thanks,

-Miles