For those not familiar with Kickstarter and its terms, here's a fictional example:
I am Catalyst, and want to produce a BattleFace box, and decide to Kickstart it. I determine that it will cost me $100,000 to get a full production run made. I set up the website on Kickstarter, and essentially tell folks that enough people pledge money that it totals $100,000, the box will get made. (Note: The money is only charged at the end of the Kickstarter. If not enough money is pledged by the time the Kickstarter ends, no money is charged at all, and the box doesn't get made.)
The Kickstarter goes live, and progresses well, with plenty of pledges. Since it looks like the interest is there, I start setting up stretch goals. I tell folks that if we reach $150,000 in pledges, the extra money will go towards making the rulebook hardcover instead of paperback. If we reach $200,000, the plain dice will be made of endo steel. If we reach $1,000,000, each box will contain a flute carved from the leg bones of my enemies, and so forth.
Note: the above is an entirely FICTIONAL example.
Right now, the main product is looking to be the Clan Box, of which the Mad Cat is the only confirmed mini out of five. The additional lance and star boxes are stretch goals, that will only happen if the campaign exceeds its goalby a certain amount. It is entirely possible for us to get the Clan box, but no Marauder box.