As said if you pledged enough all the expansions are free, and they should be. Now if they have a 'collectors' edition of an expansion those extra's could be sold to backers for additional funds, but they are not needed to play the game. An example the free to the backers has a new digital downloadable map of a new system or such, and those who purchase it get a cloth map or fold out map. You can buy them if you wish, or as downloadable print them out.
You get it all, but if you want the 'bonus' of a real map pay extra. So if you want the fluff pay extra. Some will, some won't but it is an option, and not needed but may be nice for some to have.
Other items, computer voice we all get one. They add more make them a purchase. Not needed as you have a default voice, want other voices buy them. So the deluxe version may include one extra free voice, as part of the expansion we also get it for free, but they add some later not an expansion then buy it.
Calebe
You get it all, but if you want the 'bonus' of a real map pay extra. So if you want the fluff pay extra. Some will, some won't but it is an option, and not needed but may be nice for some to have.
Other items, computer voice we all get one. They add more make them a purchase. Not needed as you have a default voice, want other voices buy them. So the deluxe version may include one extra free voice, as part of the expansion we also get it for free, but they add some later not an expansion then buy it.
Calebe