Uhm.. I read it the way you did it for a couple of times and then decided that it's really just a bad way of saying 'back early (25 max) and get a board for $100 less than the next 25 people on the first batch'. In other words: No, I really don't think they give you a $100 rebate for ~$1100 and a full board for $100 more..
Not my native language though..?