The Points Guy broke the news - from some comments Delta's CEO made publicly earlier this week:"We're still assessing what we'll do, but there will be modifications that we will make, and you'll hear about it sometime over the next few weeks," Bastian said."

Link here:
https://thepointsguy.com/news/ed-bas...miles-changes/
I am someone who spoke to Delta, Amex, and anyone who would listen. Its sounds like others spoke out too