Update: It seems that the audio files belong to a small event which teased the appearance of the A.I.M. cosmetic, the reward for completing the Hunting Party challenge.
Patch v6.22 has brought a new vehicle into the game files, and it seems to be unlike any before it.
Sounds leaked might hint at it being an air vehicle, as well as multiple references to being "overhead" and such in the names.
It's possible we're seeing our first look at an upcoming air vehicle, which could either be a plane or some other form of transportation in the sky - depending on what Epic Games choose to do.
Either way, we're pumped! You can view the leaked cosmetics for Patch v6.22 here.
Source: FNBR Leaks