Short answer: If the Kickstarter is successful, we'll have to wait and see if sales of the game will cover development costs for mobile development. If the Kickstarter is VERY successful, we would be able to consider those things from the start.
Longer answer: If the project does super well, porting the game to mobile platforms is an immediate priority after getting the base game developed on PC/Mac. Our development tool makes it easier to deploy games on mobile platforms (much more so than the original Auditorium), but there is a significant amount of time and expense involved in optimization, testing, and tweaking.
We want to make Auditorium Duet as good as it can be on the desktop, and be sure we can get the multiplayer experience down pat before we start experimenting on mobile platforms.
For international shipping, if you are outside of the U.S. and are receiving the t-shirt, print, or plaque, please add $10 to your pledge, and then we'll cover the difference. If your pledge is already $10 over your reward level, you're good to go.
Before our first update, those reward levels had different rewards. We changed things around to reflect user feedback and suggestions, so those older levels should be locked. However, Kickstarter policies require us to keep the old ones up, but you can safely ignore the old panels!