This is what De Kock had said,
So I think this could just be assumed that he is plying for T20 franchise Cricket but it's nothing more than a rumour at this stage.
Like the previous star Proteas keeper, watch him play in every T20 league around the world eventually. Although remaining active in the other two formats will keep him in check for now.
Tests are probably the format where his absence will be least felt. Verreynne is arguably the best middle-order bat in the country now and will seamlessly slot in. On a scale of Jos Buttler to Adam Gilchrist, I'd say he falls somewhere in the middle. Did well on occasion (those hundreds versus the West Indies for instance) but it feels like he never did completely play as good as he should have for his talent. There was talk of promoting him to four or five as a specialist bat which shows how well regarded he actually was.