The "consideration" of an antitrust probe is just consideration; it is not an official probe yet.
I read through the allegations and believe that they are extremely weak allegations. Access to U-tube is one of the issues. Big deal. These allegations are nothing like Microsoft's Explorer web browser probe related to denying access to the internet ( much more serious).
At the heart of Google's new FTC probe allegations is Microsoft whining and being vindictive. Ballmer's attack dogs are aiming for Google.