Just from running over to the regular site for UE < http://universalelectricity.com/ > and seeing the lavish update and new, cleaner formatting you can see that galacticraft, biotech, and even chemistry (ee3 killer) will be developed to flesh out this modpack soon.
Granted we are waiting to hear news about railcraft and are seeing more of a holdup there (IMO) but patience is called for and if we are lucky we might get some sort of update from the modpack dev team shortly about an status.
Til then keep mining/crafting/building in expectation of the release.