Fans of Sniper Elite they will be glad to know that Rebellion published a press release in which the company confirmed that the next game in the series is currently under development.
It is possible that the fifth chapter will be based on the existing Sniper Elite 4 engine, perhaps with more open-world environments w more detailed slow-motion kills.
Unfortunately, this new game will not be released anytime soon. Rebellion stated that further development details will be published in the 2020. In short, it seems that we are talking about a title coming on the next generation consoles.