So in my opinion you should be careful about how much money you are expecting out of this. If you're lucky, you can repeat the success that Double Fine had. But still you probably should not put in a number such as 1 million dollars to start with.
It's clear that Double Fine aimed too low with 300.000 for the game (+100.000 for the documentary), but you have to remember that you don't usually see numbers this high on Kickstarter. You should probably aim for a game that you can make with a few people and a low budget of something like 500.000 dollars.
So from the technical side something old school without voice acting and probably with 2D art.
And then the idea of this entire thing is to fund a game that wouldn't get made through the classical publishing process. And I do believe that your chances of Kickstarter success are highest if you do something like that.
That being said I would like to play a truly fantastical game again. As in a game outside of the boring elves'n'dwarves fantasy worlds. And I would like to play something that is really heavy on story. Which doesn't necessarily mean that there has to be a lot of story, but rather that the story is very important to the game.
Otherwise I'll trust you to do something awesome.