During the Letter from the Producer last week, Yoshida confirmed three more traditional summons from the FF franchise would be making an appearance. He even showed off gear that would drop from the Primal to appear in patch 2.2. So far he has confirmed Leviathan for patch 2.2 and Shiva and Ramuh for patch 2.3. No more additional details are available about the new primals to appear. Yoshida did mention in the video that they would be able to start talking about patch 2.2 details in the January Letter from the Producer to be held in Osaka. So Leviathan might make an appearance there.