With 60fps Live Record Mode you can Record Audio on the current version of Firmware.
I dont exactly know how long thats been there, but recently accidentally had Live Record Mode on, and checked the File, it does indeed record some Audio.
Internal Mic Level is low, and also the Fan Noise usually is so loud (on mine not so much, as i replaced the Stock Fan With A much more Silent Noctua one, so even on the Internal Mic you can somewhat make out what is Happening and even hear Normal Level Conversations a bit away) that you can make out almost nothing of the Sound you are Trying to Record, except Loud Screaming and other Extremely loud Noises, and any External Signal fed into the Camera via the 3,5mm Jack needs to be Pre-Amplified, just Plugging in a Standard Microphone like on your Headset wont work. You will need some Kind of Pre-Amp or a Line-Out Signal. Camera has, from what i can tell also no built-In Audio-Level Metering, so beware of Clipping, and Run some tests as to what kind of Signal-Level the Camera wants to have to record Usable Audio (and Maybe even Consider Sharing Results, if you do).