No, Unity will never return to WebPlayerdetailed their plans in this blog post. It will useUnity plans to target the WebGL platform instead, and recommends that new web games start with Unity 5 WebGL as the default target. Please read this blog post: http://blogs.unity3d.com/2015/05/28/web-publishing-following-chrome-npapi-deprecation/
The Web Player will remain supported "as long as it's useful for developers", as NPAPI still works in other major browsers.