www.apple.com.au/macosx
"Do anything with Mac OS X
Panther"
"Mac OS X
Panther v10.3 gives you everything you need to live in the digital age."
"
Panther provides a luscious, liquid interface, called Aqua, across every application and the utilities you need to control and customise your Mac."
"
Panthers simple and elegant design is easy to use and intuitive for new users, with powerful features for professionals."
And so on.
They were advertising it on their main/home website (
www.apple.com), showcasing the upcoming features and going through What's New and all the rest of it, but you're correct, 10.3 is Codenamed: Panther
www.apple.com.au/macosx/newfeatures