Along with the following spoiled cards, DailyMTG.com confirmed that all five decks will include Lightning Greaves.

One thing that confused people was the rarity being assigned to cards for Commander. Well tonight we get an explanation from @mtgaaron on twitter:

Vow of Duty Unc. Enchantment – Aura Enchant creature Enchanted creature gets +2/+2, has vigilance, and can’t attack you or a planeswalker you control. Wayne Reynolds 36/318

Mana-Charged Dragon Rare Creature – Dragon Flying, trample Join Forces – Whenever Mana-Charged Dragon attacks or blocks, each player starting with you may pay any amount of mana. Mana-Charged Dragon gets +X/+0 until end of turn, where X is the total amount of mana paid this way. 5/5 Mike Bierek ?/318

Ruhan of the Fomori Myth. Legendary Creature – Giant Warrior At the beginning of combat on your turn, choose an opponent at random. Ruhan of the Fomori attacks that player this combat if able. 7/7 Raymond Swanland 221/318 StarCityGames.com

Command Tower Com. Land : Add to your mana pool one mana of any color in your commander’s color identity. Ryan Yee 269/318 MTGCommander