I dont think Asmodee is going to be doing the expansions. From my understanding you can only download the PnP versions from http://www.yc-games.fr for free. I wish Asmodee would sell them though because I would love to buy professional quality counters.
Also the designers had said that the WW2 version was going to be published and I think that they are hoping that version will do well and bring more attention to the Sci Fi version. There is a discussion of it here: http://boardgamegeek.com/thread/318694