I hope that by now you would have heard of the system requirements for the next Mac OS. I didn't plan to use it but I think that I simply won't be able to. Oh, there will be ways to get it on unsupported machines with XPostFactO or some other utility. There will always be a way.
On the other hand, I believe that the operating system will no longer support the G3 chip. That is, from what I've heard.
I just heard that it wouldn't support (according to Apple) chips under 800mhz. You should be within that, aye.