Although the bundle has yet to be announced, a 250GB Xbox 360 / Kinect bundle can be seen on Microsoft's Australian packaging for the 4GB Xbox 360 / Kinect box.
The 250GB bundle appears to be very similar to the matte 4GB bundle, with the exception of the larger capacity hard drive, a glossy finish, and the inclusion of a headset. It isn't clear what game comes with the bundle, though it's most likely Kinect Adventures, the standard offering in both the standalone Kinect package and the 4GB Xbox bundle. The 250GB model also has the following note: "Hard Drive includes game and demos." The demos we're used to, but it seems that Microsoft may be foregoing an extra disc and putting the pack-in game on the hard drive itself.
We're following up with Microsoft for more details, pricing and – yes – international release plans.
Update: Microsoft's official response to Joystiq: "We have nothing to announce at this time."