The Tech Report writes AMD is cooking up the AMD Z-01, a 1GHz APU with a TDP of just 5.9W. The chip is adopted by a new Windows tablet from MSI.
In other words, the newcomer could be mistaken for a version of the C-50 tuned for lower power consumption. 5.9W still sounds a little on the high side compared to Intel's new Atom Z670, though. The Z670 offers x86 compatibility, integrated graphics, and 1080p output capabilities within a TDP almost half as small (just 3W).
Nevertheless, the new Z-01 chip has been adopted by MSI for its new WindPad 110W tablet, which purportedly has "the longest [battery life] of any tablet with Windows architecture." The 110W offers "six-plus hours of battery time" and complements the Z-01 with 2GB of DDR2 RAM, up to 64GB of solid-state storage and 802.11n Wi-Fi. I expect a relatively beefy battery accounts for much of the device's 1.87-lb weight.