The fourth JPAAWG General Meeting was held on November 11-12th of 2021, using a virtual format. DMARC.org once again provided a pre-recorded presentation, this time in three parts. The three sections are: an overview of BIMI, a survey of recent IETF activity related to email, and various statistics about email authentication. This statistics section includes data through the third quarter of 2021 about BIMI policies and DKIM key size, as well as DMARC.
The video can be viewed on YouTube, dubbed in Japanese, here. The presentation itself is available to read here.