Tecmo, sensing a disturbance in the fanboy force, sent out a preemptive email today explaining to anyone and everyone why Fatal Frame 4 was not at E3 this year.
Actually, to be fair it's more like they passed the buck... preemptively:
Several of you asked about Tecmo's other titles that have been announced in Japan which were not on display at the show. Fatal Frame 4 (Wii) will be published by Nintendo, so please contact your Nintendo PR contact for further information. Rygar: The Battle of Argus (Wii) is in development and we are planning to provide more information this fall.
I contacted Nintendo for comment and take their stony silence as complete confusion. We'll update you as soon as they update us.