So, do you plan to add any more major features before release of the next version? Or is it "just" a question of finishing up, balancing and polishing what's on the list?
A pedantic answer depends on how you define "features", but that aside, it feels more like "just" finishing up. However, that involves adding a lot of content, some UI work, and some work on game systems. For example, need to take a good look at smuggling, exactly how it works, what consequences it has, and what UI support it needs. That might also lead into adding a hullmod or two. Are these "features" or "finishing up" an aspect of the trade system? As another example, an initial UI for intel/news reports exists, but I suspect it'll need some major revamping in light of how events actually turn out gameplay-wise.
Content-wise, need to add and flesh out several events; this can involve altering existing systems to support how these need to work. Another big content task is populating the new star systems with fleets, which can take a bit of time. There is also new art and sounds that need to be created, and the
possibility of something new on the music front.
Then there's playtesting and balancing, which, given the sheer number of changes and amount of new content, is likely to take longer than it usually does.
There are a few miscellaneous tasks, too, but I think the above covers most of what's left.