Everyone assumes the DVX200 is 4:2:0 like the GH4, but I have not seen any specification. Similarly, everyone assumes this is the GH4 sensor but I have not seen any specification. There are other unused MTF sensors already announced.
You would need either cfast or p2 card to handle 4K bitrates higher than 100mb, so even if we are wrong, it's reasonable to assume 8bit 4:2:0 on board. 3G SDI is only for HD resolution?

