He’ll be working on Unturned (version 3) until the end of this month, basically.
RAM usage optimization, upgrade to Unity 2017, potentially a new set of cosmetics or two, a new timed curated map (most likely near the end of the month), and a couple other things.
This is basically Nelson’s mindset for Unturned II, except it’s being applied to every Devlog and other such teaser he puts out.