Zoe is the newest hero launching into League of Legends with the 7.23 update. She's a mage that uses burst magic to take down enemies as well as salvaging an opponent's own spells to use against them. With abilities like "More Sparkles" and "Sleepy Trouble Bubble", it's easy to see that Zoe is a perky little thing.
In addition to Zoe, thee are the typical tweaks and balances being applied across a number of heroes and their abilities. These include Gragas, Nunu, Ornn, and Shyvana. Larger adjustments are being applied to Sona and Taliya. A number of new skins are being deployed for several characters.
A new game mode is being introduced called PROJECT//: Overcharge. It features 3v3 gameplay on a marksman-only map. The objective is to kill other players and rack up 50 points before the other team. There are various buffs called Augmentation fragments that can be captured to apply a significant stat increase and an immunity to damage.
Past the balance side of things, we've adjusted post-30 EXP curves and the First Win of the Day mission reward based on your feedback. Hearing your thoughts is incredibly important to us, so please keep them coming! We're also knocking out a few longstanding feature requests: The Skins Tab, the ability to spectate Challengers, and about a year's worth of updates to the Game Info site all land this patch!
You can check out the full update notes on the League of Legends site.