What are the respective purposes of the emberjs.com and ember-cli websites?

I am a bit confused regarding the ember websites "emberjs.com" and "ember-cli.com". Isn't ember-cli now a part of emberjs and documented at "emberjs.com"? If so, why have a different website for ember-cli? Also, why do the sites differ regarding the versions of the prerequisite JS frameworks? For example, the emberjs.com getting starting page says to use Node.js 0.12 or higher while the ember-cli.com site says to use the latest stable version of Node (version 4.0.x).