> you may have heard that WinUAE has got/will get CyberstormPPC emulation

Yes, it was released 6 days ago, also including BlizzardPPC emulation.

> Current state of WinUAE with PowerPC is rather like a proof of concet
> (slow and not too stable), but maybe in future [...] speed will reach
> levels where is actually provides something useful.

I read it's rather fast (faster than Sam460 with certain tasks on recent hardware), except for FPU code, and also very stable.

> when a ppc JIT will be avalable

WinUAE's PPC emulation (which is QEMU actually) *does* have JIT.