ABC News is saying that it is:

A brief statement released by Mueller’s team Friday morning does not say what information Flynn has provided the government as part of the deal, but people familiar with the agreement told ABC News Friday he has made a decision to assist investigators.

The general told confidants about his decision to plead guilty in the last 24 hours, according to people close to Flynn, who say the former adviser feels Trump has abandoned him and has agreed to answer questions about the president or anyone else.