Scanning real 3D objects in is something we're most probably not going to see, or only in some very simplified way.
First of all, you would have to scan the object from all sides to get a proper 3D representation. Doing that precisely in a simple, consumer-friendly way would be rather tricky.
But that's notthe main problem. Because the much bigger problem is that the accuracy of Kinect's distance sensor is in the range of several centimeters. That's perfectly fine for example to identify a human body standing in front of a wall or in the middle of a room. Kinect should also be capable of creating a rather accurate 3D representation of a person standing in front of it, because a human is a rather big object, and since human bodies are rather similar in shape, a small number of parameters (height, length of legs, approximate abdominal girth etc.) are enough to rather accurately describe a human body. So if the system knows that it's supposed to scan a human body, it only has to measure a few parameters.
But if Kinect would try to scan a 3D object which it doesn't know anything about and which may even be rather small, being only a few centimeters accurate is a major problem for creating an accurate 3D representation.
But as others have already pointed out, scanning a 2D image (for example the design of a real skateboard, to use it as a texture on an in-game skateboard, or scanning a picture you painted, or scanning a 2D barcode) will of course work fine. But that's simply not very amazing, that's possible with every webcam and has already been used with the Playstation Eye a long time ago, so Microsoft will not advertise this as some kind of interesting feature.
