I was planning to set up a system for taking pre-orders asap after the Kickstarter campaign, but I've been so busy that "as soon as possible" turned out to be not very soon at all. It's still on my to do list though and I hope to get around to it within a reasonable time.
Buying the game after release will of course be possible.
However, you will not be able to order the same edition as the Kickstarter backers. They will receive a backer edition.