Microsoft prepping slimmer Xbox 360 console?

Earlier today, a Chinese tech forum purportedly posted a pair of pictures of the newly remodeled motherboard, which has undergone a massive size reduction from the current iteration of Xbox 360 hardware. A few noteworthy changes in the motherboard (full pictures of which can be found after the jump) are a consolidated GPU/CPU (one of the rumored features of the Valhalla chipset), an extra SATA port, and a much smaller heatsink. Though the design could just be a mock-up from an extraordinarily talented modder, it certainly looks like professional-quality work.