Sorry I don't use Fedora Core. I can only speculate: I think it will be the same PHP version as you get with Plesk 8.0.1. But I'm sure you can install youself a newer PHP Version and that works. As I said, I'm using PHP 5.20 with Plesk 8.1.0 together without any problems...
I hope this helps you a little bit.
Greets and best regards,
Dawn