I sure hope he has learned since Petunia and is not going to write it in assembler... You get more benefits in actually optimizing the high level algorithms rather than writing everything in asm, as is proven by the fact that Trance is significantly faster than Petunia. Trance is written in pure C.
But welcome news, regardless.
As for this being any kind of advertisement for any platform: forget it. x86 has had their JIT for ages, they're not going to bother with some PPC platform just because it 10 years later finally gets JIT. Since the code will be GPL it will not be locked to OS4, and thus there is no "lock in" factor either. Why would you obtain a 1000+ USD machine just to run this code when you can run it on your PS3/Wii/Mac just as well, and even better?
Now that I think about it, if I were to do it I'd actually write the JIT on Linux or Mac OS X and then backport it to amigoid systems. Lack of memory protection and some badass debugging tools (valgrind) would be just pain it the arse.
Im not suggesting it'll convert anyone from x86 to ppc, or from anything else to OS4, but the simple fact is to the ppc emulation world this is potentially pretty big news, ergo it'd be relevant news to post to quite a few sites, ergo a little extra public awareness of OS4, even if just in reference to when the GPL 68k emulation core is coming from. It's hardly going to change the world, but mass exposure does often result in a few extra curious onlookers.
Thinking about it though, and Im not just saying it cos of who I directed the post at, perhaps a little ironically it could even benefit MOS a little too. People interested enough to be intereted in amiga emulation on a ppc mac, may find out about MOS while researching the "new" amiga, which in turn may find them trying it out if they have a supported model.
Personally it doesnt really have much influence on me (being a x86 AROS and 680x0 amiga guy), but I think this is something people could jump on to give a little exposure to the amiga outside the usual places.