New toolbar for editing in Vector: How to get?

Question

Using MediaWiki 1.16 with the Vector skin (fresh installation, no upgrades or imports), how do I get that new fancy Ajax-enabled editing toolbar?

I've digged through all available settings in php, but whatever I do, I get the old monobook-style toolbar:

Apparently, this is not a caching issue, as I was able to use this method to add more buttons to this toolbar.

Currently I have the following customizations:

$wgDefaultSkin = 'vector';
$wgUseAjax = true;
$wgEnableMWSuggest = true;   # Enable ajax suggestions for search box
$wgGroupPermissions['*']['edit'] = false;   # Disable anonymous edits

I've also enabled short URLs as described here.

Everything else on my wiki looks definitely like Vector. It's just the toolbar.

The official manual seems to be making a good laugh out of me, as this new fancy toolbar said to be "the default" for the Vector skin.

Answer 1

It appears that the new toolbar is an experimental feature that you have to install: http://www.mediawiki.org/wiki/Extension:UsabilityInitiative