Confirmed
Confirmed by Riot
From Riot's own video, developer replies on social media, or season recaps.
- A brand-new around-game client will be integrated into the in-game experience instead of being a separate app.
- Summoner's Rift gets 'entirely new visuals' and 'a bit of new gameplay'; some changes also reach other maps and modes.
- Runes and pre-game choices will change, and the new-player experience will be rebuilt.
- The custom Hextech Engine is upgraded and takes in the client; Meddler also confirmed players 'of course' keep their skins.