Been looking on the website for it and you can "Save more than 25% by purchasing the Arma 3 DLC Bundle 2, which includes the upcoming Arma 3 Jets, Arma 3 "Orange" (working title), Arma 3 Tac-Ops, and Arma 3 Tanks DLC!"
https://store.bistudio.com/products/arma3-dlc-bundle2
There are some screenshots of the new jets on the page too under the Arma 3 DLC 2 Bundle title.