Skintracker reports of the new skins & case
New portion of hats skins will be added in the game soon enough, our guess that it would be before or during PGI, however it could possibly be wrong because all the stuff is ready and waiting in the game client to be launched.
The new «Aviator Crate» consits only cosmetics (no gun skins) and would require a special key to open it. The rarest item would be jeans shorts with the chance of drop 0.16%.
Check out all the rest on skin-tracker
Besides that dataminers managed to find out a new parachute skin named "Bengal Tiger Parachute", which has to be enabled pretty soon. He won't be a part of the new crate, probably u would only be able to buy it out for $2.50.