Probably an accurate translation of the last rumor:
"Another banana to skin..."
Code name: Nadir
Architecture: z/Architecture
# Of Processors: IFL01 derivative + zIIP02 derivative
# Of Cores: 6 (Kernel mode 2 cores)
# Of Threads: 12
Operating frequency (processor 01) : 920MHz
Operating frequency (processor 02): 262MHz
Instruction set: 64 bit
Endianness (?): Big Endian
Floating-point format (IEEE 754): Binary128/Decimal128
Integer execution unit: 5 per core
SMP: 4-way per core
Level 1 (L1) cache: 512kb per core
Level 2 (L2) cache: Associative 2MB, 12-way set per core
Level 3 (L3) cache: 12MB per core (eDRAM)
Memory management unit (MMU): 2
Process Technology: 14 nm SOI
Code name: Zenith
Architecture: Custom
Stream processor: 500
Engine Clock: 710MHz
Texture Fill Rate (billion / sec): 29.44
Size / Type: 512 GDDR5 SGRAM
Memory clock: 1GHz
Memory Interface: 512-bit
Memory bandwidth: 153GB/s
Frame buffer: 15936 x 15936 pixels
Frame buffer memory: 1.4GB
ECC memory: Checks for these
API support
OpenGL (ES, SC)
COLLADA
OpenRL
Universal 3D
X3D
http://www.ign.com/boards/threads/wii-u-specs-in-japanese-now-with-less-thread-lag.452746814/page-2