The change logs contain a list of fixed bugs as well as some hints about new feature like support for configurable keyboard shortcuts. They also link to download locations on Opera's webserver. Caution: Do not use beta versions on productive environment, since they have not been tested as thoroughly as official releases.
You can download Opera 6.03 Final (build 219) from Opera. Read the official changelog for Opera 6.03 for Linux.
Please bear in mind the following warning that has been posted along with some of the earlier changelogs for the Windows version: "This build is experimental and may cause problems. Use it only on properly backed up computers. Do not distribute this build or pointers to it to anybody not on the official distribution. It may contain or reveal confidential information about Opera customers, business plans, or other restricted information."
You can always download the official version from Opera's website.
1 November 2002
Martin Schrode <webmaster @ schrode . net>
http://www.schrode.net/opera/changelogs/linux.html