The Moto X and Google relationship is confusing at best. Google owns Motorola and doesn't give the company any special privileges, but will make sell a Moto X Google Play Edition at some point. There were some "touchy ads" that didn't go over well.
The Moto X will not ship with the latest version of Android, because Google did not give Motorola access to Android 4.3 until it was revealed with the new Nexus 7, last month. However, Google will be paying for the $500 million bill to promote the Moto X.