A brief summery of all of the changes taking place…
In terms of champions, Elise, Janna, Jarvan IV, Nami, Singed, and Taric are all getting a few changes. For Elise, her spider form is getting a bit more power, while Jarvan IV’s Demacia’s Standard ability no longer grants bonus armor. For Singed and Taric, their powers are getting nerfed. Janna and Nami are simply getting a bit of visual effect changes and some bug fixes.
In terms of items, the change hammer is coming to Blade of the Ruined King, Aegis of the Legion, Runic Bulwark, Locket of the Iron Solari, Runaan’s Hurricane, Sheen, Trinity Force, Lich Bane, Iceborn Gauntlet, Ravenous Hydra, Zephyr, Warden’s Mail, Randuin’s Omen, and Seeker’s Armguard. The most major change is Blade of the Ruined King’s power nerf.
Restricted Chat Mode will now be integrated for toxic players. This new mode will now limit how many messages can be sent through the /all command, as well as a limit on in-game messages. After completing a certain number of matchmade games, chat privileges will be fully restored.
You can read the full patch notes here.