The newest version of the FedEx API is live and usable by all customers.
In order to make the change from version 1 to version 2 you will be required to contact your FedEx account representative and request a FedEx Key and a FedEx Password for the new version.
Once you have the new login info, the changes can be made in the admin section of CV3.
Settings> Options> Shipping Options> FedEx Automatic Rate Calculation Tool
You will need to select the radio button version 2 and a new area will expand that allows you to enter the FedEx Key and FedEx Password provided by FedEx.
After the key and password have been entered you will need to save the changes.
This will make the new API active for your site.
Please contact support if you have any problems with the change to FedEx API version 2.