And then there are the stretch goals like pets, Alien languages, and ship modularity. While I have faith in CIG, that's a lot of work for a 2016 release date and I wouldn't blame CIG if they wanted to save some of those for some future patches/DLC (free for backers, paid for people who bought the game after release?).
PU updates will not be paid, but further campaign missions in the vein of SQ42 will be paid expansion packs. That kind of multiplayer dichotomy would ruin the community.
I expect the game as outlined in the original kickstarter pitch, plus a bunch of refinements, to be playable by the end of 2016 but I don't really expect much of the stretch goals to be fully implemented by then. That degree of content takes years to create, no matter how many people they could throw at it.