If volumetric efficiency stays the same as Coyote then power would be around 540hp if peak power is 8k. Looking at the changes made it appears VE would have improved. The first rumour that surfaced about Voodoo was that it had 600hp. That power figure was dismissed because it sounded too high. I'm not so sure now. I wouldn't be surprised with anything over 550hp.
The Ferrari 458 has 563HP out of its 4.5L V8 with a similar redline. I don't think it would be unreasonable to think Ford's 5.2L FPC V8 will have as much or more HP.