The Test Server was updated on Thursday with a few minor changes, no map changes as the addition of the military outposts have been delayed until the next patch because (as expected) they will require a wipe. There was a further update on Friday adding support for multiple ammo types in a single weapon and the addition of Explosive Tipped Arrow and Flaming Arrow.

These new arrows should work with all three bows and the crossbow, each of these have had their descriptions updated to read Press "B" to switch between arrow types.
Along with these additions there are also references in the game files to a new crate and a slew of new items and/or skins and the glasses added recently have had their bulk reduced from 25 down to 1. Battery has been increased from 300 to 1500, Turbos to 700 and Headlights to 900.

Here are some of the new items that have been added to the game files, this is very early data and could change at any time, and we also have no information yet as to the name of any new crates or where and how these items or skins will be obtained:
There are also some other new items that do not have any names associated with them yet.
On top of all this, there are also some data changes to Bandage, First Ait Kit, Meats, Flashlight, Bottles, MRE's, Battery, Hand Drawn Map, HQ Map and a few more which could be related to the two new Item slots (for using items).