As Richard said, the BETA is available to download right now.
As with all product releases, we wil first upgrade our external instances to the release candidates before we ship 4.0. That means confluence.atlassian.com will be upgraded in the next few weeks to 4.0. There is a "Test" space there where you can go in and have a play!
There is already a beta version here:
Oh you mean a demo? No clue. I would suggest just beta testing it and giving the developers your feedback to help them make it more what you are looking for!
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