Without spoiling the process too much, he continues the article by outlining the basic necessities for crafting legendary weapons and hints that more information can be found on forums [spoilers]. You can read the full article here.
Alongside the article is a video, posted below, that shows the animation effects for the following legendary weapons:
Bifrost (staff)
Flameseeker Prophecies (shield)
Juggernaught (2-handed hammer)
Sunrise (greatsword)
Twilight (greatsword)
http://www.guildwars2guru.com/news/816-my-legend-grows-forging-your-first-legendary-weapon/#comments