I have a corporate Verizon contact, he only works with devices. He told me that on 9/4 Verizon plans to roll Jellybean 4.3 to the Moto X. When they sell in the stores they "should" already be equipped with 4.3. People that buy it online "if it launches tomorrow" will have to wait for the update.
This is only hear say but its exciting at least.