UPDATE 2/28: RiotScruffy took to Twitter to correct a statistic featured in the most recent developer update after a mistake was pointed out on the League of Legends subreddit. The previous statistics included games of ARAM and URF, which the community viewed as misleading since competitive balance revolves around and matters most to the standard game mode on Summoner's Rift. RiotScruffy provided updated statistics and said that Riot Games will be putting out another developer update on Friday, March 5 that will, among other things, include the correct statistics updated with a new week of data.
On September 29, Riot Games released a complete list of items that will be changed, augmented, or removed starting in the 2021 pre-season. In the update, League of Legends Lead Game Designer Mark "RiotScruffy" Yetter confirmed that the changes would go live on the PBE for six weeks, and that there would be more updates regarding items for the next season in the near future.
UPDATE 9/29: Riot Games has released another update on Mythic items, which includes the previously teased Galeforce and updated versions of Crimson Shieldbow and Behemoth Slayer — Immortals Shieldbow and Kraken Slayer, respectively. 19 other Mythic items for all other champion classes were also revealed.