I never pre-order games with one exception and that is an expansion to an MMO I've been playing for years that adds content to a game I am already very familiar with and enjoy. For anything else, I cannot imagine handing over the money before I see the finished product released and I read user feedback from the pioneers about how it performs, quality of the experience, etc., etc.
That said, I hope this turns out great. I'll probably buy the Game of the Post Nuclear Century Edition with all DLC and pre-order bonuses for 20 bucks or less later.