@recidivist
Someone other than Toni would be working on the UAE bits, and WinUAE is the core of Amiga Forever. I'm pretty sure Toni has absolutely no interest in PowerPC platforms.
Cloanto's RetroPlatform could find a home anywhere, though, with a bit of effort. (But, RP9 looks like it might infringe upon the i4i patent that Microsoft ran afoul of. Software patents suck.)
