Hi Balint, the current version of ember-cli (2.6) doesn't generate an application.hbs anymore. It adds the ember-welcome-page package to show a welcome page instead.
It was easily fixed by removing the package (as suggested on the welcome page) and adding the handlebars template myself but it might confuse new readers.
Thank you very much for pointing that out, I've missed this. I've now rewritten that section to work with ember-welcome-page (uninstalling the package one step later, as you suggest it).