This text doesn't make that much sense since it's missing the pricing table image. You can see the full context at the top of this page currently:

http://www.indiegogo.com/projects/ubuntu-edge?c=activity

It looks like they intend to ramp up the price over small batches of 1,250 to provide a more graduated incentive for people to get in early than their previous 1st day only promotion. The first batch ($625 tier) is at 700/1250 sold already. (edit: and sold out < 1 hour later)