"That person" could be referring to one of the main casts VA?
They've teased special guests in their ATR's before and it was usually VA's.
However if it turns out to be Nomura, or even Sakaguchi, I'd be pleasantly surprised.
Either way, very exciting stuff and greatly looking forward to what they've got in store for the future updates.
Don't know about you guys and gals, but I find myself more excited for the updates for the base game than the character DLC episodes, with the exception of Episode Ignis because he's my favourite character.
Highly anticipating that one for sure.