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Tiers patch note
On item tiers, the patch notes for 24 June 2013 say:
Uncommon (green): one extra power, chosen as appropriate for the difficulty of the monster
Rare (blue): two or three extra powers, chosen as appropriate for the difficulty of the monster
Epic (Purple): two to four extra powers, with at least one power significantly more potent than lower tiers
Legendary (Yellow): three to five extra powers, with at least one power significantly more potent than lower tiers
Not sure if this is still valid, will check next time I get the chance
Uncommon (green): one extra power, chosen as appropriate for the difficulty of the monster
Rare (blue): two or three extra powers, chosen as appropriate for the difficulty of the monster
Epic (Purple): two to four extra powers, with at least one power significantly more potent than lower tiers
Legendary (Yellow): three to five extra powers, with at least one power significantly more potent than lower tiers
Not sure if this is still valid, will check next time I get the chance