The current release of Netscape is a completely different code base than the Netscape 4.x series. Not only has Netscape changed, it's improved.
Unless of course you count that it has a completely different code base, rendering engine, vastly improved support support for CSS, support for local scripting, ability to bring new pages up in tabs rather than windows, ability to cripple pop-ups, compliance for WWWC standards, support for themes/skins, bug fixes, backdoor fixes, e-mail reader, newserver client, support for multiple OS platforms, support for multiple user profiles...
Oh no, nothing new here. Move along to IE, sheeple. Bitch about the monopoply, but don't actually do anything about it. Sleep...sleep...
Netscape 6 is based on recent Mozilla code. Netscape 4.7 was based on code with at least a three year legacy.