Gizmodo has some proported insider information on the Apple Tablet from someone at Apple. They say:
"The device, which I've held mock ups of, is going to have a 10 inch screen, and when I saw it looked just like a giant iPhone, with a black back-- although that design could change at any time" they said, "with the same black resin back, and the familiar home button." That's obvious.
Who knows, might see this this holiday season (if it exists of course).