Mass Effect 3's Kingdoms of Amalur Crossover Content can be found in the free Kingdoms of Amalur: Reckoning demo. You can also unlock content for Amalur by playing the Mass Effect 3 Demo, which will be released on February 14
Just by playing the Mass Effect 3 Demo you will unlock the Omni-Blade daggers in Amalur.
Meanwhile, by completing the Reckoning demo before playing Mass Effect 3, you'll unlock Reckoner Knight Armor and a Chakram Launcher. EA says the armor "will maximize damage done in close-quarters combat"
This isn't the first time we've seen EA do this and it won't be the last. After all, It helps market the game and of coarse, everyone loves free shit.