Thank you for your reports everyone! I moved a few threads over to this one and changed the title here. We are aware of the mouse and camera issues. Our team have identified an issue with the Raw Mouse input and camera movements.
A few of you already mentioned this, but disable the Raw Mouse input should help with the mouse issues in-game. Enter this into the in-game chat:
/console rawMouseEnable 0
Our team is looking into this matter! Thank you again for your reports 