No Raring driver?

The drivers need to be tested - Like all other software, the nVidia drivers not only need to be packaged, but also tested before being put forward to the repositories.
Usually, a specific person or group of people will be in charge of packaging the driver and putting it up, unless the process is automated. Usually, these people also have several other projects and responsibilities and as a result need to prioritize.

A possible solution is to use the nVidia proprietary "blob" from their download server - ftp://download.nvidia.com/XFree86/Linux-x86/ - rather than the version from Ubuntu's repositories. It comes with a feature that automatically detects and installs the latest and greatest driver version.

I have no issue with using the blob, but since I need to reinstall the blob after every kernel update and because kernel updates are often enough to make this a nuisance, perhaps you can redirect me to a GOOD solution to automatic reinstallation of blobs after kernel updates.

The feature that automatically detects and installs the latest and greatest driver version:

./NVIDIA-Linux-x86-319.49.run -a --update -X --no-runlevel-check -q

So there's always the possibility of making a script to script with it to check to see if there is a new version available, and if there is, tell the user to run the utility.

There is a already filed Launchpad Bug https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-304-updates/+bug/1219908, about the slow-release cycle of the Nvidia drivers in the main Ubuntu repositories and it got upgraded to Wishlist. If this problem affects you too you can log into it and click the “this affects me too” button and let the package maintainers know that you would like a faster release cycle so you can have access to fresh drivers in sync with official Nvidia releases.

Thanks Daniel Letzeisen, that solved my question.