That one is a fake, here's some other interesting stuff to read though:
dietsoda reports on a story which was briefly on Mac-Life.de that claims to have knowledge of upcoming PowerMacs based on the contents of the mysterious boxes.
This Spymac thread claims to contain the original text on the site.
There is no "G5" shown on the outer hull, just PowerMacintosh 970. The Computers are there is two versions. Grey plastic with Aluminium or white plastic with Aluminium. The grey version has got the grill optic (grey stripes), the white is completely white, no structure. The Picture seen in here (where this was posted, --> the translator,MacCaine) is a fake, definitely. The Machines are not shaped as seen on the picture, no grill-style air-intakes. But small holes on the top and bottom, rounded out on the front. Similar to the ones from the eMacs. The Machines are rounded out to top-front side and to the front. All have got Superdrives. The sides are covered with Alu, the right cover can be opened to access the inside. On top and bottom, the machine has got 2 polished steelparts. The Slots for the drives are in a "box that can be pulled out!!!!!!" On this box is the Apple Logo and "Powermacintosh 970" It can be rotated 90 degr. If rotated you can use the machine as desktop or as tower. There is space for 5 drives - optical or HD. on the frontside there are 1 FW 800 Port, Headphones, Mic, bluetooth logo, three apple typical buttons, and chromed speaker. on the back are 1 FW 800, 1 FW 800, 2x USB, 1 USB 2.0, ethernet, ADC, DVI and four diagonal PCI Slots!!!!!, speaker connector, mic. Size of hull.: 15cm x 65cm x 40cm
Note: It's probably more likely the report was pulled for being a fake than being real. There is a new alu/white keyboard, optical 2 button mouse without cord, srollwheel made of alu, bluetooth
