Fedora 18 for Power is currently in development. The schedule is following the one for primary as closely as possible Fedora 18 schedule.
Current Status: F18 GA has been released to the mirrors and will be announced Tuesday, January 21st 2013
Areas of Focus
Fedora rebuild efforts
There are currently efforts ongoing to recompile all packages and prepare a F-18 release.
This is the current status of the package rebuild: