Between early access and live

[Masamune1004]

There is not supposed to be any interruption between the Early Access period and the Release unless something major crops up and makes it necessary to pull down. However, apparently you will need to register the game code you receive with your release copy of the game so that your service will not be interrupted, as the early access code only seems to give access until the 30th.. :/

The EA code is not directly tied to your account code, so they need to do this to make sure you actually have the game (see the numerous threads about people preordering, using the code, then cancelling the preorder).