I might be wrong, but the video from the 2014 LC seems to use the stock cameras! The only thing holding me back from buying this unit is the lack of OEM camera support and the LC video here got me excited
The LC is different than the LX. On the LX I can tell you for sure that the factory cameras do not work unless you put some time into figuring out how to get it to work. For me it was easier to just get an aftermarket 360view system. And I'm glad I did, the resolution is MUCH better than the OEM cameras, well worth the upgrade.
The external microphone came with the package. I did not buy anything additional. You can use the system with the built in microphone or you can plug the external mic in and place it wherever you want. I tried both and the external microphone was noticeably better.Your video mentions an external microphone. I haven't seen that anywhere else- is that part of the kit or aftermarket? Simple plug and play? Looking at the Landcruiser versions the microphone appears to be on the right side of the screen which would be appropriate for a right hand drive vehicle, but I expect it will be pretty poor for US spec. I know you can't speak to the Landcruiser version, but I'm hoping the wiring is similar.