The mystery of that spooky teaser email has been definitively solved. Atlus announced plans to localize Persona 4: The Ultimate in Mayonaka Arena for PS3 and Xbox 360, under the title Persona 4 Arena, which we won't have to look up every time we write about it.
Developed by Arc System Works, the fighter features battles between Persona 3and 4 characters in high-resolution 2D, and will be delivered to North America this summer. So if you were planning to summon a demon to bring this to you -- or import a copy -- you can cancel plans for those extreme measures.