I want to believe.
Sony realizes that Persona could be an important franchise, so they gave them dev kits years ago and worked with them to make the game for the new system. Hey, Atlus was listed on devs working for the PS4. E3 happens, and Teddie pops up on the screen between segments of Sony's conference to announce it as a PS4 launch title.
Odds of this: 0%. BUT I WANT TO BELIEVE.
I've always thought if you're going to dream, dream BIG.