Sappharad wrote: Are the "upgrades" just the physical add-ons that we have pictures of, or do we know if they let KS backers upgrade to higher KS tiers that weren't limited? I'm already in the tier I wanted to be in at the end of the KS because I wasn't really interested in any of the higher ones, but I'm willing to throw more money at them.
I actually pledged partway between two tiers, so I should already have change in my account for Add-ons. I'd probably be a good test for their system to make sure it handles that scenario correctly.
Not sure if I understood your question but anyway, whatever add-on you see on the image below is all that there is regardless of of your tier pledged during the KS phase (speaking out of experience with other projects, but please someone correct me if I'm wrong). If you really want an upgrade above what the add-ons offer, then you should look into the slacker backer page for stuff ranging from having your personal message displayed in an inn's guestbook and physical collectible capsule toys to the ultimate luxury items like the crystal sculpture and Ryo's leather jacket. Though only the jacket and crystal sole tiers could be called an upgrade, as for the rest you would be double dipping on a lot of stuff you probably already pledged for.