This is a power-optimized, especially binned version of the Z-01, which was released last year, which was itself a power optimized, especially binned version of the C-50. The only news here is the new 4.5w TDP of the Z-60 instead of the 5.9w of the Z-01.
Technically speaking, this is still the same 40nm Bobcat APU, with 2 x86 cores at 1 Ghz and a Radeon HD 6250, VLIW 5, 80 core GPU, clocked at 276 / 275 Mhz.
In other words, this has the same performance as the C-50 (or C-60 if you disable Turbo). The difference I think is that both the Z-01 and the Z-60 support DDR3L in addition to the regular DDR3.
Given that it's still manufactured with 40nm technology, and comparing the 4.5w TDP to the original 9w TDP of the C-50, it will be interesting to see how many of these Z-60's AMD will be able to make.