Well, they almost made it. They kept it a secret, and just a day before their E3 Press Event it leaks. Well, it sucks to be them, doesn't it? Today it leaked on an Italian Gaming Website that the Xbox 360 Slim will be hitting shelves this Fall. Key features that are known as of now include built in Wi-Fi Connectivity (presumably B, G, and N), a 250 GB Hard drive, and of course a slimer design. More details to be released, when Microsoft formally announces the device tomorrow.
UPDATE: It was confirmed. $300. Dedicated Kinect Port. 'Nuff Said.