the extensibility of the TURRIS OMNIA is quite limited. A housing physically compatible with TURRIS MOX A would allow to attach TURRIS MOX modules to the TURRIS OMNIA. In my case TURRIS OMNIA is always short of ethernet ports. Attaching the MOX E (Super Ethernet) module to TURRIS OMNIA would solve this.
I can’t speak for the Turris team, but changing future Omnia batches to support this seems rather unlikely to me. It seems more likely that there would be an alternative CPU module for MOX that would be more powerful (CPU + RAM), but I’m personally skeptical about finding sufficient interest to make that financially feasible.