I watched the entire vrchat dev stream thing at https://www.twitch.tv/videos/599790043, here's a summary of the new parts

new UI
- putting release notes in game
- old menu running out of room
- udon worlds can add custom menus
- "wings" to personalize menu/pin pages
- full user profiles visible in menu
- "out in the next 6 months™"
- job posting for graphics/UI designer next week

avatars 3.0
- you can replace the entire animator controller
- can add up to 5 different "layers" of controllers
- non-transform animations (fixing material swaps in mirrors)
- can turn off 'auto footsteps' (finalIK/running animation)
- different gestures on each hand
- new UI 'action menu' in spiral shape, has emojis/emotes in it
 but customizable with "hundreds" of items
- avatar "moods" to switch to a set of animations/emotes
 internally, change animator state variables
- custom icons with custom images/text for moods/emotes
 will transfer with the avatar (e.g. for public avatars)
- you can hold the end of animations, or loop animations
- alternate exits out of animations as well
- eye tracking "eyelook" for generic non-humanoid avatars
 will work with blendshapes or object transformms
 can set up limits and preview eyelook in unity now
- "look back" eyelook for "social triangle"
- visemes can also be part of animator controller
 e.g. whole animations, partilcles, not just blendshapes
- no automatic conversion from old avatars
 but action menu will be backported
- don't need multiple animators on avatars anymore
- station (chair) animators will also be just as powerful
- soon™
- couple more positions hiring