It looks like our initial source was mistaken because the Snow Leopard developer preview build contains a document stating that it's compatible with Intel only. Sorry PowerPC. But even if Apple were to release a Snow Leopard for the aging platform, there's no way that developers could take advantage of the software's real assets-multi-core optimization. As for our original source, they explain, "There were still updated PPC drivers [in the build I saw], though, so *shrug*. I'd say that indicates that it must've been a decision made late in the development process." [Logiciel Mac via MacRumors]
@Nintenboy01: By the time Snow Leopard is released, it will be about 4, and I think a bit longer for anyone who only keeps laptops (the Powerbook was gone before the Powermac).
@sototallycarl: Overall I think you're right. The PowerMac G5 IS powerful, but compared to the systems made now, I wouldn't want to do any sort of video editing on it. With time being a factor, I'd rather put my investment in a modern intel than an aging PowerPC. Anyway, I'm sure a lot people who still use their PowerMacs for their stock n' trade have not even upgraded passed Tiger, and probably won't see much reason to for a long time, at least until Leopard is fully fixed.
@VakeroRokero: Perhaps because they still work. I will never throw away my G4 PowerMac until it sputters and spits sparks and bursts into flames. It has one of the nicest cases, and for something that's over 4 years old, it runs a present day OS like a champ.
@praevalesco: I'm disappointed by this, but seriously, how long should Apple be developing for hardware that's pretty much been obsolesced all to hell? As much as I'd like to be able to put Snow Leopard on my G4, it's well over 3 years old, and still has, at the very least, a little over 2 more solid years of the same features until 10.7. My guess is that there's not much more that can be done with the PowerPC architecture.