It is 4K ready, and is not ready to spring into 4K action once the firmware arrives.
It has a proprietary 4K output that can only be recorded externally, you guessed it--- with a new sony video recorder that is yet to be announced, and will cost $$$$. Presumably, they will have some sort of converter that makes the output editable.
Anyone believing that they will get 4K Capability for $8-10K is going to be in for a shock. However, all ready to go, it might be $14-16K which is not bad.