For what it's worth, the Project 2025 documents with all of these measures written down as bullet points has been up for a while. Getting rid of China's de minimis exemption is listed on page 789.

Americans, American businesses, and businesses with American clients would be wise to read through the document to see what they can expect the coming year(s). The current executive branch sure won't give you a heads up, but the plans are out in the open.