Pretty fancy stuff on the way from Mass Effect 3 and Kingdoms of Amalur: Reckoning. The two teams (both under EA) are combining forces to give away some exclusive items for both games, including a Todd McFarlane-designed armor for Commander Shepard in Mass Effect 3.

You don't need me to tell you how cool that is. Full item bonuses as follows

Mass Effect 3: 

• Install the KoA: Reckoning demo to unlock the Todd McFarlane-designed Reckoner Knight Armor.
• Complete the KoA: Reckoning demo to unlock the Chakram Launcher.

Kingdoms of Amalur: Reckoning:

• Play the Mass Effect 3 demo to unlock the Omniblade Daggers.
• Purchase KoA: Reckoning while owning Mass Effect 3 to unlock the N7-inspired Shepard's Battle Armor.