The biome vote of course.
They showcased a bunch of spin off games (probably all Bedrock).
Minecraft dungeons, Minecraft Earth, a board game (Builders and Biomes)...
A bunch of silly contests.
The Nether updates (for 1.16 I believe) look fantastic, new biomes with Nether trees, a new mob, a new look and new and more active behaviours for the pigmen.
A new redstone component, the target block, which gives a redstone signal when hit by arrows (proportional to how close to the center it is hit).
A runthrough of the bees and all the uses of the new honey block.
Minecrafts Twitter page has short videos for each section, in the order they happened in case you want to scan through the main video for the full segments.