With drop 3, Carbine is adding more housing stuff, including the first creature-like decor items, rewarded for Silver and Gold medal dungeons.
Drop 3 will also add music, an increase to decor items allowed and many other things.
They've also released a few of the things we'll see in Drop 4, such as terrain changes.
You can read all about it in the dev tracker here.
What are you hoping to see with the new additions?