As every Monday, yesterday the long-awaited client update 236 was released. You need to open the Updater to get it, or you can download the full client with all updates already applied directly from the Downloads section here on the website. The patch is for weapon skins, which work as a new equippable item from the inventory. What they do is change the appearance of any weapon you have equipped, similar to how costumes change the appearance of sets regardless of which one you equip, but with weapons.
Backup of the old website:
