Yep, that is the norm for test mules like this one.
I actually saw a test mule of the new CLK in person this february.
It was light blue (kind of like our Steel blue) and had fabric coverings over hood and trunk. The rest of the body was taped wherever there were any creases, lines or moldings.
The interior was hidden up as well, especially the parts where you would normally find the MB logo.
It took me a while to figure out what car this was, couldn't believe that this ugly hunk of junk was the new CLK. That said, I do like the look of the new CLK from the press photos, so there is no judging the outcome from these test photos.
I've been saying it for some time: The E60 will look good and the E60 ///M5 will be the new