If I can create a full-stack preview environment comprised of all these services, that will be huge. It's edge (no pun intended) is that it's globally available by default.
Monday was Workers talking to external services + durable objects.
Tuesday was upgrades to workers and the toolkit to make it easer to develop full apps on them.
Wednesday (today) was Worker+Pages integration and front end development.
No announcements yet of any upgrades to the Worker Key Value store, wouldn't be surprised if they have a day of datastore type announcements - its the part of the "full stack" they haven't covered this week yet.
They have to climax on Friday with something big right?
I was worried for a bit, but they put a significant amount of time into explaining how they want to work with others to develop some kind of standard.
Hopefully the client API is also something that can make its way back into the browser at some point.