Noman Games could't bother to post here, Steam only announcement, hopefully we'll receive the update as well.
The most relevant introductions are
Challenges - daily, weelky, monthly, ongoing
Challenge points
Challenge rank - a monthly leaderbord, that is
The rest is unlockable cosmetics for the account.

https://nomadgames.co.uk/blog/challenge-update-preview

I wish they'd tackle some of the bugs and poor rules implementations first, or overhaul the wretched AI. Creating a tutorial actually worth a damn (and/or an in-game manual, or an encyclopedia of terminology and mechanics) would be nice as well. But I guess getting people more invested in their Nomad accounts is pretty important, too...