The stretch goals are all for the physical expansion, except the final one that will add multiplayer to the app.
Did you miss my post with that information? 
I think they said in the comments that they may go to iOS/Android, but they weren’t sure yet. But that was when I checked a couple of weeks ago, so that may have changed.
I think it’s a terrible campaign, myself, and without having played the game itself, there’s no way I’m backing it. Maybe if the game gets to the table this weekend (highly doubtful), I might, but without multiplayer, it’s kind of pointless for me.