Nothing, for now. When the campaign ends, you'll receive an email with instructions for accessing the post campaign pledge manager. We will honor the original pledge levels, and allow original backers to upgrade based on those initial prices.
If you were originally a Champion level backer and would like to upgrade to Kensei, you may do so using the original Kensei price ($70).
Original backers will have their rewards shipped at the same time as backers of this new campaign.