Fact
Blizzard's Enhancement Shaman video (reported by Wowhead, Oct 1) says the spec is built only around two-handed weapons and does not dual wield. Its tools: Rage of the Farseer (3-min attack speed cooldown), Maelstrom Weapon (cheaper, faster Lightning Bolt), Mental Quickness (spell damage and healing from Intellect) and Windfury Totem.
Confidence note
Official (Blizzard video, via Wowhead)