Python 3000 started as a project on 05-Apr-2006. There was not a single line of code written before that, nor a description of the feature set. It was just a joke, like the Parrot april fool's joke.

That's easy to disprove:

... at BeOpen.com we will be focused full time on Python development! This means that we'll be able to spend much more time on exciting new projects like Python 3000.

[Python-Dev] ANNOUNCEMENT: Python Development Team Moves to BeOpen.com, Guido van Rossum, May 30 2000

You can also find Python 3000 related PEPs and discussions in the list archives from 2000.