Possibly the biggest additions to the game in this latest H1Z1 update is the Kurama Medical Facility which brings with it a lot of new items and content for the core game including a whole load of new medical items that can either be found or crafted at the hospital, you can find them all listed on our site here, scrubs that can be looted around the facility and unrelated to the hospital there is also a Ghillie Suit that can now be found at the military camp.
On top of all that there is also the introduction of some small lore and quest content similar to the Worn Letters, these can be found in the form of Locker Key F1 - 207 which will gain you access to rarer loot (note that this is not currently finished on the Test Server yet, there are no boxes to open) and the ability to call in free airdrops if you find an Airdrop Code.
These airdrops will contain some rare items like scrubs and other items.