The big news is he said flatpak is coming soon, like 1 week. Regarding the battery said:

“We do something that reduces battery usage in almost every release - 5.8 had a notable improvement, and 6.0 will have it too. Battery usage is not one big thing to work on, it's many small things each contributing a little bit. User-visible server stats will also ship in 6.0 - it'll help a lot identifying battery drains.”