[M2Ys4U]

They used to keep a blog, but they stopped updating it years ago.

[jared314]

Before any speculation starts, one of the team members did explain why they stopped updating:

https://news.ycombinator.com/item?id=7028850 (12 Days ago)

[probably_wrong]

They promised they would update it again once they were done with the book. But yeah, it's been a couple years since the last update.