With just hours left to go before The International 10 main event starts, SteamDB has spotted one more update for the game: https://steamdb.info/app/570/history/
Size is ~70 MB (with Workshop Tools installed). More info will be edited in when available.
A quick item schema update has made it so that the Treasure of the Crimson Witness 2021 (added in update #1 to accompany that blog post) can now be opened