New portal experience not available for everyone

Hi Christian, I think this is part of a wider rollout of the https://support.office.com/en-us/article/New-Office-365-web-experiences-to-help-you-get-started-and-simplify-working-with-your-apps-and-online-documents-f7985f7b-c1f6-4cb7-b2ba-079a6375b379, which is still being deployed to First Release.  It's going to be in First Release for at least the next month and the roll out to the rest of the world is expected to be completed by early 2018.  

While this deployment is ongoing, some users may have this feature while others might not until the rollout is completed.  In my tenant, I don't have the new office.com look, nor the new app launcher but I do have the new app gallery, so there is some variability.  The Message center is the best place to track the progress with this, as it continues.