This discussion took place three years ago, and we have been working very hard to make it happen. But we are now done: Bugzilla 5.0, the next major release of Bugzilla which will be released later this month on April 31, will be based on Python 3.4, meaning that Bugzilla 4.4 was the last major release to be based on Perl. We hope this migration to Python will trigger more contributors and will increase the development rate of Bugzilla.

Bugzilla 5.0 comes with many major changes. Just to name a few:

• Support for Internet Explorer (including IE 11) and less known browsers has been removed. You must now run Firefox, Google Chrome or Safari, which fully support HTML5, else an error message will be displayed asking you to use one of these browsers.
• You must have Java 8 installed and enabled in your browser in order to upload new attachments. This way, sanity checks can be done client-side before the attachment is uploaded to Bugzilla. If you don’t have Java installed or enabled, you can still view existing attachments, though, but you won’t be able to upload new ones.
• The version 5.0 of Bugzilla can be downloaded for free, but security fixes (5.0.1, 5.0.2, …) require that you register to our server to be able to download them. The fee isn’t expensive: $20 per security release for installations with less than 10 users. $200 between 10 and 50 users. $1000 above 50 users. As we do security releases only once every 4 months or so, this means that you can keep your installation safe for only $60 per year (or $3000 for larger installations).
• For other changes, please read the Bugzilla 5.0 release notes.

Enjoy!

http://lpsolit.wordpress.com/2014/04/01/bugzilla-5-0-moved-to-python-bye-bye-perl/