Well actually not, an aftermarket company called EDAG is soon to make these available. Although it is not supposed to increase trunk space, but I bet you could get something there, although it might scratch the trunk lid.
http://www.cycloneinjapan.com/upload..._Soltice_4.jpg
http://www.cycloneinjapan.com/upload..._Soltice_1.jpg
http://www.cycloneinjapan.com/upload..._Soltice_3.jpg
http://www.cycloneinjapan.com/upload..._Soltice_2.jpg