Yes, support for Netscape is ending. I'm a bit surprised because Netscape 9.0 hasn't been around for very long. Netscape 9.0 was (is) based on Firefox 2.0 and updates for Netscape followed closely any security updates released for Firefox 2.0.
Netscape will continue to work but since it won't be updated anymore, it would be best to do
as recommended here and switch to Firefox.
SeaMonkey is another alternative if you prefer an 'all-in-one' suite that includes a browser and e-mail program.
More on the subject
here (read the questions, answers and comments in the page).