GitLab EE's source code is also available, though not under an open source license. Most of the differences are things I'd like to eventually see in an open source project (maybe GitLab CE, maybe a plugin, maybe a fork).

From my perspective the best thing would be for them to eventually open source some features I'd like to have in an open source project hosting service, once they've made more reasons for people to pay them. The worst thing would be if someone added it in a plugin or fork of GitLab CE and the company GitLab were to claim that they must have looked at the GitLab EE source code. GitLab Pages and audit logs are the features I'd most like to see in the open source version.

This is much like Nginx Plus's improved load balancing with health checks, which has me considering Tengine.