This is a fairly significant update. Some of this was already made available in the previous security update but here it all comes together.
This update includes the 2nd tier of tech tree upgrades which cover automating the systems unlocked in the first tier. On top of this the systems that you will upgrade and build out in the first tier have been reworked in some ways. Where previously you would have not had access to the laser turret until much later, it is now one of the first weapons techs you will unlock alongside missiles.
You can catch some of the early work on automation in this video here
On top of this comes the new dialogue system.
This new dialogue system allows for a whole host of new possibilities with respect to character interactions. Where as previously conversations were strictly linear, you can now have more natural conversations with characters by asking them about different topics relevant to the current conversation. You may even find that simply talking to a character yields rewards.