This is a pretty cool feature -- but it's a pain in the butt to get to. In an attempt to make it easier I created a Greasemonkey script that appends the "?complete=1" so you don't have to. Click here to install this script, or create your own with the code:
// @name Google News Suggest
// @namespace http://www.aimx.com/greasemonkey
// @description Makes sure Google News uses the suggest feature.
// @include http://news.google.com/
window.location.replace(window.location.href + '?complete=1');