New button in the lower right corner of the screen, a blue rectangle saying "Improve this page".

Like it will attract people to improve pages. Believe it, Sue Gardner!

I now present to you all a revolutionary way to attain improved pages.

1. Get higher-quality editors.
2. Give them incentives like protecting pages they'd be willing to spend hours on.

Alternatively, switch the two around.

Well that was a waste of time.

I clicked on the button and nothing about the page improved.