Yes! If funding is successful, there are plans to release a small expansion of additional item cards to integrate into the current game.
If funding is VERY successful and we start revealing additional stretch goals, well, let's just say the current game box has enough room to fit in these additional item cards.
As for the idea itself, the game scales well with additional items added, but it's a little tricky as every item added changes the appearance % of other items. The common items need to stay common, and the rare items need to stay rare, otherwise it's too hard to make the cheap sets, and near impossible to make the rare ones.
So, the expansion items would come in 2 varieties:
1) New items that are added to the existing item deck, as is, and simply become another set you can go for (or an extra Special item, in one case).
2) New items that *replace* an existing item, or *any* number of that item in the deck.
For example, you now have the "Magic Boomerang", which has its own effect and unique color (green). One of the new items is the "Hexed Boomerang", which is the same color green, same gold value (5), but a higher infamy value, and a different effect of going into an opponent's storehouse instead when it's revealed.
The choice is ultimately up the player group, but in this instance, there would be options for either replacing *all* Magic Boomerangs with Hexed Boomerangs, or only half of them, and you sell a set of *any* boomerangs together—if you have 2 magic boomerangs and 1 hexed boomerang in a set, they sell!
It would bring a variety of new effects to the game (including an entirely new effect type), so it might be a little much to keep track of for new players to the game, but add another level of depth for those familiar with it.