Any news on the s4 mk4.

With the new pioneer grv6 getting realised i was eager to buy it until i noticed it didn't include xlr and had terriable tempo faders. So naturally i looked at some alternatives in the same price range. The s4 mk3 came up and it is an amazing controller but it's getting a bit dated at this point and i was wondering if there have been any leaks of a potential succsesor?