The feeds on Live are automated. They are updated every 10 minutes by calling out to each site's RSS feed for new articles. As new articles are found, they are integrated by Live and listed on the Headline News page.
As content creators start publishing directly to Live, their channels will be displayed here and their notification times to the people following them becomes instant.
Over time and with growth, please expect this to become a very lively place with whole unmolested feeds of rich information moving at ridiculously high speeds.