MogTalk/Frosty also interviewed YoshiP and also tackled some questions about higher difficulty content since that seems to be of interest here.
https://www.youtube.com/watch?v=C79Oc_HRo1U
In short, more 48 man difficult content is coming, and may be even more group mechanic focused. Small group difficult content like standard dungeons is unlikely due to mechanic and role constraints, but small scale challenge like high floor Deep Dungeons is likely.
On a related note, each DPS type is usually intended to serve a specific role in a fight beyond just giving that % bonus for a full team variety but they don't want to go into major details on it to not force certain job choices and to allow for flexibility.