I'm most interested in the bolded sections, I look forward to seeing what you have planned on the horizon. Now while I might have preferred that to be the emphasis of the Kickstarter, you explained why you framed it the way you did. You can't give away your whole strategy, but you want to get people excited as well. That's a call that your team has to make, how much information to divulge, the risks/benefits of doing so, etc. As much as I, or anyone else, may want to critique that, you're in the best position (well, only position) to truly know the variables in play and how to move forward.
I hate to sound like a prick who keeps harping on this point, but this wouldn't have been an issue if your project was underfunded. If I recall correctly, you only get the KickStarter money if you meet the goal you set. I assume you did some calculations on the cost of minimum runs for the rewards, and then added at least that to your overall total. So if you didn't reach it, you wouldn't have to send anyone any rewards, so you wouldn't be on the hook for the cost as I doubt you had the materials printed in advance.
Of course I don't know how much you added to the goal in relation to the cost, the specifics of donor levels to rewards, or any of that. That's embedded in the risk/reward decisions your team made, so my issues may be irrelevant to the situation on the ground.