This article is from the Wall Street Journal (paywall): https://www.wsj.com/amp/articles/justice-department-probes-colleges-early-decision-admission-practices-1523075708
In short, it appears the Justice Dept has sent out letters to some ED schools requesting them to preserve emails and communications with other schools concerning ED admissions. It seems the Justice Dept suspects schools of offering admissions (or not) in part due to the admissions results of others schools.
This seems like a fairly significant development. Has there been any other news of this?