This info seems real as Konami has said in an IGN interview that Wii does have built-in physics hardware? It sounds about right. The lowend X1300 boards which includes 128MB onboard GDDR2 RAM and DVI, VGA, TV output are selling at retail for less than $70. The GPU itself comes out to less than 100 million transistors too when you take out Avivo. At 90nm using 1-TSRAM-Q eDRAM it looks to have the same die area as Flipper at 180nm. The logic in Flipper is only 26 million transistors and eDRAM only 25 million. As for the CPU a low power Sempron 2800+ level chip should fit the bill nicely. If this was what Perrin Kaplan was talking about when she said the hardcore will not be disappointed then she is right.
We also know that Wii consumes about 50W with CPU/GPU chips and RAM made at 90nm. GC consumes 37W at 180nm.
So to recap:
Main memory runs at 650MHz which is 2X speed of GC
GPU is between X1400 - X1600
2X the pixel pipelines as Flipper
8MB of eDRAM 2MB frame buffer 2MB Z buffer 4MB texture cache
4x Antialiasing and 8x Anisotropic Filtering
Fully programmable geometry engine
Physics built into GPU
CPU is between AthlonXP 2400 - 2800
90nm process for both chips
50W power consumption for Wii
Extrapolating further, eDRAM uses ~ 67 million transistors so looks like it may have to be a separate daugther die like Xenos. Looks like the GPU and CPU has double the clockspeed of GC though they have more logic to increase performance even further.