There are a ton of Linux applications that will interface with a camera with V4L. It would be totally awesome if there was a V4L driver for the Raspberry Pi Camera module.
Edit: It's here!
Check the release notes for NOOBS v1.3.3:
Check out the release notes for each distribution for more details. Highlights for Raspbian include:
New firmware and 3.10 kernel, with numerous functionality improvements.
New hardware-accelerated X driver included and enabled by default.
Mathematica and the Wolfram Language installed by default.
Updated Scratch image.
PyPy 2.2, with incremental garbage collection.
Our new V4L2 camera driver, and an updated v4l-utils package.
There is a topic about that subject on the Raspberry Pi forums. To quote one of the mods (jamesh):
ucola wrote: hi all
any news about the V4L driver?
In progress; it's a big job so I wouldn't be expecting solid anything for a few weeks.
However, the post was made June 06, 2013.
There is an unofficial V4L driver available. It was not funded be the Raspberry Pi Foundation in any way, so I guess he has done this off his own initiative. I have not tested this driver for myself yet.