Not sure what you mean. Are you talking about how iTunes will be broken up in Catalina's music, podcasts and TV shows? It won't be released in the fall. iTunes still works the same as it has for a while in Mojave, the current version of macOS.
To access iOS devices in Catalina, use the Finder. I think older "iPods" (not iPod Touch) will be handled the same way. We have to wait and see. I haven't tried it in beta myself.
See https://macmost.com/frequently-asked-questions-about-macos-catalina.html where I mention iTunes breakup.