Epic has stated that they will start placing selected community maps on the Official Hubs shortly. Clawfist has released an initial list of maps to be installed. These are differentiated from community maps that are already built-in to the game such as DM-Lea and CTF-Pistola. They will available via redirect off the Epic Hubs just like the community hubs have been doing for a long time already :).
The Unreal Carnage Hub will attempt to stay synchronized to this list as much as possible but continue to provide additional community maps that aren’t on the list.
To see the list in this first phase, you can view Clawfist’s post HERE.