From the update:
Get Niven for $10! This version of him will only be available during this Kickstarter and at conventions. We have big plans for the character though, expect to see more of him later! Expected to ship March 2013.
And of course....
If we hit this stretch, it looks like Mr Banks won't make it off this tub after all. Every one who purchase Niven Banks gets his Strained version free! Ships the same time as Niven.