It has dual remote cameras and a central DVR box, which is what you were talking about.
The fact that they are waterproof is unlikely to be a problem! Although it means that you can mount them on your side mirrors
There is no link at the moment, Viofo has posted about it on a few threads but only to say it is coming and to request testers, no details.
I happen to have one, just can't give any detail at the moment, should be able to soon, but if you want something urgently then look elsewhere.
The K2S I have uses IMX323 sensors, which do give a nice detailed image, but are not so good in the dark compared to the newer sensors and don't have as much dynamic range. Not sure what the current production units have, there was talk of upgrading them.
Not sure about the parking modes, but the Viofo may have an answer to the microphone.
Is there any new information from Thinkware? My Q800PRO also has a very bad video quality. You can recognize license plates only very rarely, actually only when driving at walking pace or while standing. I think the bad quality caused by too high compression of the video data. When will the Thinkware finally improve the video quality because at a price of 368,- Euro we can expect top quality?