We balanced some champions, tweaked some runes, added two new items and a new ARAM-exclusive summoner spell (Backtrack).
Hit up Butcher's Bridge and show us what you got! We'd love to hear about any bugs or weird interactions you encounter while playing! If you find any really strange things, we'd love to see it in all its glory!
For a full list of changes, check out this thread: https://boards.pbe.leagueoflegends.com/en/c/client-new-features-feedback/GEX2amYY-experimental-aram-changes-on-pbe?comment=0000