Hans has been working on implementing the various patterns described in the Material Design "Scrolling Techniques" page, which has a lot of subtlety. I've included some screenshots of this below too. Hopefully if we can build all those techniques into our widget library, applications written with Flutter will be able to replicate those patterns easily by just setting a few flags. One open question is how much we should bake into the Scaffold widget and how easily we can make things overridable so that you can provide your own variations.
Meanwhile, I continued to work on making Flutter apps accessible. I've been focusing on Android so far, and I've hit a major milestone: you can now navigate Flutter apps with the TalkBack service, hear the labels, and press buttons! You can see this in one of the screenshots below, where I've turned on TalkBack's captions so you can see what it's reading out. There's still lots to do, and it's still relatively buggy, but I think we have a good foundation.