Some of the physical rewards could potentially show up as add-ons.

I don't know how likely a non-Kickstarter physical release would be; I guess it would depend on how much extra effort it would take to organize vs how busy everyone is close to release, whether increasing the number of units would increase the production costs (ie if one manufacturer could not handle a larger order, and another had to be found), and how much demand there was from those who missed the Kickstarter or Early Access players (if applicable), etc.