Actually, I think it’s better they get the Kickstarter tiers in place first. This game is still a good year to year and a half away from release, so there’s little point of tossing in a bunch of little digital in-game things they’re probably not even at the point of thinking about yet. Those add-ons really have nothing to do with the tiers (which may be the point) and are unlikely to be much more than a cosmetic or minimal physical/weapon difference.
As for the prices of the tiers, it’s fair for them to make them slightly more expensive than they were during the Kickstarter phase. The ones who pledged are the ones who got this thing funded so successfully, after all.
Physical add-ons of some kind would be cool, but again - there’s no great deadline to get all that stuff done right now. Even the Kickstarter backers are going to be waiting a while to get their physical goodies.