A few weeks ago (Update 89) they presented the issue they would like to give people who ordered physical copies the chance to play on Day 1 even if the discs were late. To remedy this, they said physical copies would be given a digital key.
Yes, I already had a digital key, but I ordered two copies of the game, and one was physical. I ordered two copies so two people could play it, so I still needed the second key. The first digital key (redeemed on steam) is only good for one person.
You can find links to Update 89 and 90 here:
They did take this into account in Update 89 ( http://forums.obsidian.net/topic/70459-update-89-backer-rewards/ ) and then in Update 90 ( https://forums.obsidian.net/topic/70586-update-90-shipping-and-strategy-guide/ )
They stated they would give out a digital key for all physical tiers so that we could play Day 1. I kickstarted TWO copies. A digital and a physical. This would imply that I would get a second digital key based on the poll results and their posts. It seems that they didn't take into account that I ordered two copies for two separate people, and now only one can play.