Weeeell, nobody really knows what the Connect store will or won't get in the future.
Although I do think it's a safe bet that they're trying to increase their offerings, we won't be able to tell what they'll get until they get it. That being said, I have already noticed a few titles being added that weren't there at the first opening of the store.
If Sci Fi is what you want, you can try (if you haven't already)
BAEN Publishing -- they have a pretty good and growing collection of reasonably priced, DRM free books, and a fair number of free samples to get you hooked good and proper.
