I can confirm what samir666 said about the sound working and the gameplay working. I can also confirm that on the main menu the mouse is not working but keyboard keys are. I am also using a multi monitor setup (3). Window mode the mouse starts working on the main menu but the resolution is bad. I also noticed using the process monitor that arma3 seems to be using multiple threads (10+).
I really want this port to succeed so I can play breaking point with my friends.
Keep up the good work team!
Specs
Fedora 22 - Build 4.1.6-200.fc22.x86_64 - Nvidia 346.72
i7 3820k - Asus 750 ti - 32GB - 2x S840 Pro Raid 0
