USTR has posted the Federal Register notice announcing the process for the proposed List 4 China 301 tariffs.  You can view the draft FR notice here - https://ustr.gov/sites/default/files/enforcement/301Investigations/May_2019_Proposed_Modification.pdf.  The notice will be officially published in the Federal Register this week.  The proposed 25% tariffs cover approximately $300 billion worth of imports from China, almost everything that isn’t already subject to the additional 301 tariffs.  USTR will hold a public hearing on June 17.  All requests to testify must be submitted by June 10.  Final comments will be due seven days after the final day of the hearings.  

The administration announced that President Trump will meet with President Xi during the G-20 Summit at the end of June. A final decision on the List 4 tariffs will likely not be made before that meeting, but could come soon after.