I don't want to try an unwise upgrade and then really be stuck.
The betas are not discussed here. If you're interested in the beta, apply for it, and read the information you are sent on prerequisites.
RH9 is giving us a lot of headaches - it has some serious bugs and it is not clear that RedHat will offer fixes for them.
I already have the beta. (I guess that's what you get with 7 open bug reports. :) )
I couldn't find specific informaiton other than
"Linux system with glibc 2.2.5 or 2.2.93 and the 2.4.X Linux kernel."
and I don't know if that means RH9 or not.