It looks like it’s now possible to upgrade your pledge via the official Satellite Reign website. If you go to the pledge section, you should see a new option to upgrade. The official announcement is probably imminent.
update 29. sept.:
this appeared on the forum:
Everyone is in our system now (what a “fun” experience this has been ;P) …I will be sending out the rest of the emails soon… :)
– Chris
update 30. sept.:
we now have an official Kickstarter update about this.