Will it also eventually roll out for those with Intel Integrated Graphics?
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.
Mozilla is just using a conservative, staged rollout to limit the impact of bugs.
gfx.webrender.enabled
gfx.webrender.all
Works fine on my HD4600.