Item rarity rules will not be used. In modern 4e terms,
all magic items are Common, functioning as magic items have for the rest of the game's history. Item daily power limits are removed, as they are in the most current 4e RAW rules. A specific item power can only be used once per day (for daily powers) or once per encounter (for encounter powers) no matter how many copies of that item you have. Characters who use a weapon or implement in each hand with the same enchantment may instead use that enchantment's power twice per encounter/day as appropriate. (Discussion
here).
