Is there for sure going to be a pledge manager?
In the comments for the campaign they have said that they want to go to print as soon as possible after funding, so it is unlikely they will be using a Pledge Manager. So if you want the game, back it for full price now.
Not sure how they're going to handle collecting additional shipping costs without a Pledge Manager though. And don't get me started on the whole "refunding every international backer $10+" thing - they're currently just throwing over $1,000 in the garbage by doing that. But there's nothing they can do about it now.