FTC Investigating Sony/Bungie Deal

The Information reports (may require registration or subscription) that the United States Federal Trade Commission is investigating Sony's announced deal to acquire Bungie for a reported $3.6 billion. It doesn't seem clear at this point what sort of peril this creates for the potential transaction:
The Federal Trade Commission has opened an in-depth investigation of Sony’s proposed $3.6 billion takeover of Bungie, the gaming studio behind Destiny and Halo, according to people familiar with the matter. While the FTC may not be able to block the deal, its decision to review it is the latest example of how aggressive the agency is becoming in reviewing mergers.