We have rotated the 10 free Champions, and posted the next week's free Champions. Shen is now free in case you haven't unleashed your inner ninja yet. Check it out below.
The new 10 free Champions are:
Week 20 (this week):
Evelynn Melee DPS Gangplank Melee DPS Heimerdinger Support Janna Mage Katarina Melee DPS Rammus Tank Sivir Ranged DPS Taric Support Veigar Mage Shen Tank
Amumu Tank Annie Mage Ashe Ranged DPS Ryze Mage Sion Tank Soraka Support Teemo Ranged DPS Zilean Support Nidalee Melee DPS Poppy Melee DPS
And attached is a chart of past Champion rotations.