The official Windows NT PowerPC, thanks to Rairii, runs on the Wii U today, although without sound, networking and other misc. issues. But it does run completely solid. Work is currently being done to leverage all 3 cores found on the Wii U. Runs on vWii mode only as of today, though.
For the record, the Wii U is NOT like a G4, because it lacks the PowerPC SIMD instructions known as AltiVec (Motorola/Freescale/NXP) AKA Velocity Engine (Apple) AKA VMX (IBM).
So, yes, it's like a G3 Mac, like the GameCube and the Wii. However, unlike those, its clock speed is MUCH higher (comparable, but still slower than, clock speeds of higher-end G4 Macs), and the fact it has 3 cores. G3s all had one core previously, and at most Macs were equipped with 2 CPUs, but not more (exceptions exist, such as 4-CPU Tsunami architecture PowerPC Mac clones, and of course the later 64-bit PPC G5 "Quad" which is two CPUs with two cores each).
The main thing though is that the Wii U has a completely kickass GPU, way beyond what existed for PowerMacs at the time.
In any case, my point is that if WinNT PPC can run on Wii U today, the potential is clearly there for ReactOS PPC. Unfortunately, however, although ReactOS is unstable anywhere, it is ESPECIALLY unstable on PowerPC: the ReactOS team simply doesn't care enough about the architecture for it to happen. Of course, they will accept volunteers.
