I could definitely see Apple taking up the name "OSX Lynx" for their next OS release - although, they're really running out of easily identifiable types of wildcats 😀
If they did make a transition in the theme of their naming schemes, I definitely don't think they'd adopt anything space related - since Google seems to already have done that (Android, Nexus) and Samsung (Galaxy) etc. - following in the footsteps of two of their largest competitors doesn't seem very Apple-esque. I could be wrong, though.