Kickstarter alpha/beta keys will be revoked on release (and new keys issued for wherever the backer selects).
I didn't do Kickstarter, I went through the Steam Early Access. I wonder if they'll be handled differently or the same. For every SEA game I've purchased there was only just one key, and adding it to your Steam library simply allowed access prior to the game's release and then seamlessly into and beyond launch with no further player intervention required.
