There is new trend of moving back to server side rendering. It was first introduced by React and now other frameworks are starting to follow suit. For example Angular 2 https://www.youtube.com/watch?v=0wvZ7gakqV4 . Can we have similar feature in GWT ?

The issue tracker has moved to GitHub: http://www.gwtproject.org/lifeofanissue.html

That said, for this specific topic, I think you should rather start a discussion in the forum: https://groups.google.com/d/forum/google-web-toolkit It's been announced that the next release after GWT 2.8 (namely, GWT 3.0) will be a major breaking change, and that widgets might not even "survive"; so a request for enhancement the answer might be "no". There are other ways to do "rendering" with GWT though, that don't preclude server-side rendering, so I suggest starting a discussion instead.