We've have previously been told of a Kinect bundle, where you get the camera and a Xbox 360 S sporting a 4 GB hard drive, but now it has also been confirmed that there will be a limited Kinect bundle with a larger (250 GB) hard drive.
The price of this bundle lands at £299 (UK) and $399 (US), and the idea is not to make this a permanent bundle, but rather something that's available at launch.