If you want a really good feel for what this will be like, lock together a body cap and a rear lens cap and hold them flush against the lens mount of your camera.
Indeed, if it's really under $200, I can easily see it becoming a popular choice for a replacement body cap! think about it...you can either cap the body with a bulky lens (even the Plastic Fantastic is awkward as a body cap), a functionless piece of plastic, or an actual lens that's right about at the textbook "normal" focal length for full frame.
I'll personally wait for some lens reviews...but if the IQ wide open doesn't suck, I can easily see getting at least one per body.
b&