As pointed out by Thomas Riepe on Mathoverflow, yesterday Ivan Fesenko released overview notes on Shinichi Mochizuki’s work, with lots of efforts to relate IUT to earlier “mainstream” knowledge. And several workshops are planned in Europe and Japan in the coming years. To quote Fesenko:
The mathematical vision and perseverance of the author of IUT during 20 years of work on it is admirable.
A valuable addition to this is his investment of time and effort in answering questions about his work and explaining and discussing its parts, via email communication or skype talks and during numerous meetings and seminars at RIMS.