In the latest issue of Weekly Shonen Jump magazine, Refia (voiced by Yoko Hikasa) from the Final Fantasy III Remake on Nintendo DS was confirmed to be making an appearance in World of Final Fantasy. Refia can be called out to heal your party members health, recover any stunned allies and so on. Directly below her we can see FFVIII protagonist ‘Squall Leonhart’, who we have seen a few times before.
World of Final Fantasy is due out on PSVita and Playstation 4 sometime this year. Thanks @Kazu4281 for providing the scan.