A search engine as an app?
You type some phrases into an app, the app displays results in a webview, you click the SERP, then what? a browser opens?
Why don't you use the browser on your phone directly for searching?
That's why I think Google is working on some ROM feature, not an app. Or maybe there are some misudnerstanding from the "source"
If it's an app it's doomed to fail.