Ah I didn't know this, that makes more sense, I guess they wanted to isolate such a release by GPU to resolve immediate issues per release.

Will it also eventually roll out for those with Intel Integrated Graphics?

Eventually… https://bugzilla.mozilla.org/show_bug.cgi?id=1479781

You can enable/disable webrender in about:config if you want to try it out (gfx.webrender.all). I've switched to it on my laptop (HD Graphics 620, Gentoo Linux). So far so good.

Confirmed, Ubuntu 16.04 on dell xps works fine, and the added boost in perf is noticeable (or the placebo effect is not).

On my case that just results in a black page for every site.

Webrender will by the default everywhere ... eventually.

Mozilla is just using a conservative, staged rollout to limit the impact of bugs.

You can force-enable it in about:config:

    gfx.webrender.enabled
    gfx.webrender.all

Works fine on my HD4600.