Prerelease:Final Fantasy IV
This page details one or more prerelease versions of Final Fantasy IV.
This party is impossible in the final. The closest this party can happen is the first Tower of Babil dungeon where your party consists of Paladin Cecil, Kain, Rosa, Yang and Adult Rydia. Despite this, the Tower depicted in the screenshot cannot be Babil because the enemy formation is exclusive to the Tower of Zot, Golbez's off-screen flying tower where you save Rosa.
In addition, Rydia cannot cast Quake as a child, especially not with that character level. It should be noted Cecil's HP is that of when he becomes a Paladin, so it's possible this screenshot is entirely a fabrication to avoid spoilers.