And please no spoilers, have not seen them yet
Well, you can hardly spoil at R&M, since each episode has its own plot.
But now to your question:
With high probability on Netflix and Sky ✌🏼
Yes, season 4 is coming to Netflix on June 17. But unfortunately I can't tell you whether only the first 5 episodes come or all 10. But I think that all episodes come sooner.