Confirmed: Previewed by Evan Erwin on The Magic Show.

According to poster on MTGSalvation, the next sword for the cycle (Light & Shadow, Fire & Ice, Body & Mind) will be, Sword of Feast and Famine:

Sword of Feast & Famine Myth Artifact - Equipment Equipped creature gets +2/+2 and has protection from green and from black. Whenever equipped creature deals combat damage to a player, that player discards a card and untap all lands you control. Equip ?/155 MTGSalvation.com - 1/20