I've never heard of any PPC development happening at Commodore.
That is correct. PowerPC only came to the Amiga after commodore went bankrupt. The first PowerPC chip shipped in an IBM workstation in October 1993, Apple launched the first PowerMac in March 1994, Commodore went bankrupt in April 1994.
Amiga Technologies said they were porting AmigaOS to PowerPC in 1995 along with new machines with Phase 5 providing the cards for existing machines, ESCOM died in 1996 and Phase 5 had to come up with their own software support, which later turned into the PowerUP vs WarpOS war.
WarpOS became standard even though there were really compelling technical reasons why it shouldn't, the same reason Trump gets elected and people love Apollo
CBM was focused on the Hombre chipset using PA-RISC and an AGA/M68K SoC. The SoC would allow cost reduced low end classic Amigas and could be included with a PA-RISC machine for backwards compatibility.
Hombrew was a clean break from the Amiga, it didn't use AGA or 68K at all.
A couple of documents turned up earlier this year "Hombre: Beyond Amiga (October 8th 1993)"
http://eab.abime.net/showthread.php?t=87342It would be nice to see the HDL for Hombre, but it's likely unfinished and contains copyrighted PA-RISC as well. PlayStation was similarly designed in HDL mostly from an LSI library, then cut down. From what I can tell the PlayStation was a better design, I've always felt it was the spiritual successor to the Amiga.
If Commodore had survived these architectures would probably have seen them through to a transition to x86.
And then they'd have died trying to compete with Dell/HP/Compaq/etc.
It's kinda weird that nintendo, sony & microsoft transitioned to PowerPC years later and then Sony & Microsoft have followed apple to x86 as well.
Even the later slim ps2 had a power pc hidden in them, running a software emulation of the IOP (IO Processor, which is also used for running PS1 games).
