MA-400 Microphone Adapter - What do we know about it?

The MA-400 microphone adapter works with the C300 Mark II I believe and will also work with the upcoming XC15. But what do we know about it?

I searched around but there seems to be little info on this piece of important equipment.

Do we know how it powers the microphones? Can it run of electricity, does it pull power from the camera or does it have its own batteries? If it pulls from the camera can we plug in the camera without it pulling from batteries?

Does it have just two XLR inputs or more? Any other ports?

I saw one picture where it seems to have a touch pad on top, what is that for and does it swivel out as I would often not be able to see up there when shooting some videos?

I also wonder whether some of it such as the shotgun mic arm is detachable as I rarely use shotgun mics.

I currently use Tascam DR-60D for audio, and while not perfect it does a very, very good job. I am though thinking of upgrading to the DR-70D to get an extra XLR input which would be good for 3 or 4-person interviews / discussions.

So what do we know about the MA-400?

Thanks.